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Syntax-highlighted code editor

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Basics 🚼

Basic PHP syntax

Hello World!

<?php 
$i = "World!";
echo "Hello ".$i; 
?>

Comments

<?php 
// One liner

# another one liner

/* This is
a multiline
comment
*/
?>

Defining Functions

function sayHello() {
    echo "Hello!";
}
sayHello(); // Outputs: Hello!

Variables

$i = 1;
$pi = 3.14;
$stringName = "value";
$names = array("John","Jane","Jack");
var_dump($names);

var_dump

Dumps information about a variable.

$a = array(1, 2, array("a", "b", "c"));
var_dump($a);

Objects

class foo {
   function do_foo() {
     echo "Doing foo."; 
    }
 }
$bar = new foo;
$bar->do_foo();

Escaping characters

echo "\n"; //New line

Line feed	\n
Carriage return	\r
Horizontal tab space	\t
Vertical tab	\v
Escape characters	\e
Form (page or section separator)	\f
Backslash	\\
Dollar sign	\$
Single quote	\'
Double quote	\"

Loops ➰

For and while loops in PHP

For Loop

// For loop count to 10
for( $i = 0; $i < 10; $i += 1) { 
    echo $i . "\n"; 
}

Foreach Loop

// Declare an array 
$arr = array("tesla", "bmw", "audi");  
// Loop through the array elements 
foreach ($arr as $element) { 
    echo "$element "; 
}

While Loop

// Declare a number 
$i = 10; 
// Counting down to 0
while ($i >= 0) { 
  echo $i . "\n"; 
  $i--; 
}

Do-While Loop

$i = 10; 
// Counting back to 0
do { 
    echo $i . "\n"; 
    $i--; 
} while ($i >= 0);

Useful Links 🔗

A list of free useful resources.

PHP.net PHP Compiler Online MS Copilot Stack Overflow DEV .to PHP The Right Way Buy Scripts from CodeCanyon SitePoint PHP Builder Reddit r/PHP Tutorials Point Geeks For Geeks PHP Classes phpMyAdmin PHP Beautifier

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Operators 🔣

The compiler performs specific mathematical or logical manipulations.

Hover your mouse for explanation.

$x + $y	Addition
$x - $y	Subtraction
*$x $y**	Multiplication
$x / $y	Division
$x % $y	Modulus
$x $y**	Exponentiation

Assignment

x = y	x = y
x = x + y	x += y
x = x - y	x -= y
*x = x y**	x *= y
x = x / y	x /= y
x = x % y	x %= y

Comparison

$x == $y	Equal
$x === $y	Identical
$x != $y	Not equal
$x <> $y	Not equal
$x !== $y	Not identical
$x > $y	Greater than
$x < $y	Less than
$x >= $y	Greater than or equal to
$x <= $y	Less than or equal to
=++$x	Pre-increment
$x++	Post-increment
--$x	Pre-decrement
$x--	Post-decrement

Logical

!$x		Not
$x and $y	$x && $y	And
$x or $y	$x \|\| $y	Or
$x xor $y		Xor

String

$s1 . $s2	Concatenation
$s1 .= $s2	Concatenation assignment

Arrays

$x + $y	Union
$x == $y	Equality
$x === $y	Identity
$x != $y	Inequality
$x <> $y	Inequality
$x !== $y	Non-identity

Conditions ⤭

Conditional Assignment Operators

If statement

if (condition) { 
// execute this if condition is true
}

If - Else

if (condition) { 
  // do this if condition is true
} else { 
  // do this if condition is false
}

If - Elseif - Else

if (condition) { 
  // code if condition is true
} elseif (condition2) { 
  // condition is false and condition2 is true
} else { 
  // if none of the conditions are met 
}

Switch Statement

switch (n) { 
case a: 
  //code to execute if n=a; 
break; 
case b: 
  //code to execute if n=b; 
break; 
case c: 
  //code to execute if n=c; 
break; 
  // more cases as needed 
default: 
  // if n is neither of the above; 
}

Ternary

Variable = (Condition) ? (Statement1) : (Statement2);

$result = condition ? value1 : value2;

Is the same as:

if (condition) {
	$result = value1;
} else {
	$result = value2;
}

Functions ♞

Functions are reusable blocks of code that perform specific tasks

Parameters

function greet($name) {
    echo "Hello " . $name;
}
greet("John"); 
// Outputs: Hello John

Default Parameters

function greet($name = "Visitor") {
    echo "Hello, " . $name;
}
greet(); // Outputs: Hello, Visitor

Return Values

function add($a, $b) {
    return $a + $b;
}
$result = add(3, 5); 
// $result is 8

Variable Scope

$number = 10;
function multiplyByTwo() {
    global $number;
    $number *= 2;
}
multiplyByTwo();
echo $number; // Outputs: 20

Anonymous Functions

$greet = function($name) {
    echo "Hello, " . $name;
};
$greet("Alice"); // Outputs: Hello, Alice

Built-in Functions

Built-in functions for various tasks, such as string manipulation, array handling, file operations etc..

String: strlen(), str_replace(), substr()
Array: array_merge(), array_pop(), array_keys()
Math: abs(), ceil(), floor()
Date: date(), strtotime(), mktime()
File: fopen(), fwrite(), fread()

Arrays ⧚

A PHP array is a data structure that can store multiple values of different types under a single variable name, indexed either numerically or associatively.

Indexed arrays

$colors = array("Red", "Green", "Blue");
echo $colors[0]; // Outputs: Red

Associative arrays

$age = array("Peter" => 35, "Ben" => 37, "Joe" => 43);
echo $age['Peter']; // Outputs: 35

Multidimensional arrays

$students = array(
  "John" => array("Math" => 123, "Science" => 456),
  "Jane" => array("Math" => 789, "Science" => 987)
);
echo $students['John']['Math']; // Outputs: 123

Array Functions

Hover your mouse for explanation

array_change_key_case, array_chunk, array_column, array_combine, array_count_values, array_diff, array_diff_assoc, array_diff_key, array_diff_uassoc, array_diff_ukey, array_fill, array_fill_keys, array_filter, array_flip, array_intersect, array_intersect_assoc, array_intersect_key, array_intersect_uassoc, array_intersect_ukey, array_key_exists, array_keys, array_map, array_merge, array_merge_recursive, array_multisort, array_pad, array_pop, array_product, array_push, array_rand, array_reduce, array_replace, array_replace_recursive, array_reverse, array_search, array_shift, array_slice, array_splice, array_sum, array_udiff, array_udiff_assoc, array_udiff_uassoc, array_uintersect, array_uintersect_assoc, array_uintersect_uassoc, array_unique, array_unshift, array_values, array_walk, array_walk_recursive, arsort, asort, compact, count, current, each, end, extract, in_array, key, krsort, ksort, list, natcasesort, natsort, next, prev, range, reset, rsort, shuffle, sort, uasort, uksort, usort

Predefined Variables 🌎

PHP offers a wide range of predefined variables to all scripts, encompassing everything from external inputs to built-in environment variables, last error messages, and more. This information is accessible through these variables.

$GLOBALS

They can be accessed from any scope. Variables in the outermost scope are automatically global and can be used inside functions. To use a global variable within a function, you must either declare it with the global keyword or use the $GLOBALS syntax.

$a = 5; 
$b = 10; 
function addition() { 
  $GLOBALS['sum'] = $GLOBALS['a'] + $GLOBALS['b']; 
} 
addition(); 
echo $sum;

Super Global Variables

Hover your mouse for explanation

$_SERVER, $_SERVER['PHP_SELF'], $_SERVER['GATEWAY_INTERFACE'], $_SERVER['SERVER_ADDR'], $_SERVER['SERVER_NAME'], $_SERVER['SERVER_SOFTWARE'], $_SERVER['SERVER_PROTOCOL'], $_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_TIME'], $_SERVER['QUERY_STRING'], $_SERVER['HTTP_ACCEPT'], $_SERVER['HTTP_ACCEPT_CHARSET'], $_SERVER['HTTP_HOST'], $_SERVER['HTTP_REFERER'], $_SERVER['HTTPS'], $_SERVER['REMOTE_ADDR'], $_SERVER['REMOTE_HOST'], $_SERVER['REMOTE_PORT'], $_SERVER['SCRIPT_FILENAME'], $_SERVER['SERVER_ADMIN'], $_SERVER['SERVER_PORT'], $_SERVER['SERVER_SIGNATURE'], $_SERVER['PATH_TRANSLATED'], $_SERVER['SCRIPT_NAME'], $_SERVER['SCRIPT_URI']

PHP Forms ✍

An associative array of variables passed to the current script via the URL parameters (query string).

$_GET

It's used for retrieving data from URL parameters (query string).

// URL: html6.com?x=1&y=2
$x = $_GET['x'];  // $x will be 1

$_POST

Used for retrieving data from form submissions via HTTP POST method.

$username = $_POST['username']; 
// Variable will contain the value entered in the form

Sent through form.php

<form method="post" action="form.php">
  <input type="text" name="username">
   <input type="submit">
</form>

$_REQUEST

A general-purpose array that combines $_GET, $_POST, and $_COOKIE.

Example for the same HTML as above:

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_REQUEST['username'];
    echo "Hello, " . htmlspecialchars($username);
}

Security 👮

Always sanitize and validate user input on the server-side

htmlspecialchars(): This function converts special characters to HTML entities.
trim(): This function removes whitespace (or other characters specified) from the beginning and end of a string.
stripslashes(): This function removes backslashes (\) from a string.

// Assuming form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Sanitize and trim input
    $input = htmlspecialchars($_POST['input_field'], ENT_QUOTES, 'UTF-8');
    $input = trim($input);
    // Handle magic_quotes_gpc scenario if needed
    if (get_magic_quotes_gpc()) {
        $input = stripslashes($input);
    }
    // $input is now safe to use for further processing or storage
}

Predefined Functions

These PHP variable handling functions are part of the PHP core and there's no installation required to use them.

boolval

Returns the boolean value of a variable

input	boolval(input)
0	false
12	true
0.0	false
1.2	true
""	false
"hello"	true
"0"	false
"1"	true
[1, 2]	true
[]	false
new stdClass	true

isset

To check whether a variable is empty

$x = 0; 
if (isset($x)) { 
echo "x is set"; 
} 
// True because $x is set

unset

Unsets variable

$x = "Hello world!"; 
echo "before unset: " . $x; 
unset($x); 
echo "after unset: " . $a;
// Throws warning for undefined variable

debug_zval_dump

Provides a detailed dump of a variable's reference count and type information.

$a = "Hello, World!";
$b = $a;
$c = &$a;
debug_zval_dump($a);

string(13) "Hello, World!" interned

empty

Check whether a variable is empty or not

input	empty(input)
""	true
0	true
php	false

floatval

Converts a given variable to a floating-point number

input	floatval(input)
12.3	12.3
"12.3abc"	12.3
true	1
"abc"	0

get_defined_vars

Returns the resource type of a given resource variable

// prints: stream 
$fp = fopen("file", "w"); 
echo get_resource_type($fp) . "\n"; 
// prints: curl 
$c = curl_init (); 
echo get_resource_type($c) . "\n";

get_resource_type

Used to obtain the type of a given resource

// Open a file handle
$file = fopen("example.txt", "r");
// Get the type of the resource
echo get_resource_type($file); // Outputs: "stream"
// Close the file handle
fclose($file);

gettype

Used to determine the type of a given variable

$variable	gettype($variable)
12	integer
12.3	double
"HTML Cheat Sheet"	string
array(1, 2, 3)	array
fopen("file.txt", "r")	resource

intval

Integer value of a variable

$variable	intval($variable)
12	12
12.3	12
"12.3"	12
"101010"	intval("101010", 2) => 42
"Hello"	0

is_array

To check whether a given variable is an array

Database 🖧

MySQLi (MySQL Improved) is an extension for PHP that provides an interface for interacting with MySQL databases.

Connecting to DB

Procedural:

$mysqli = mysqli_connect("localhost", "username", "password", "database");
if (!$mysqli) {
    die("Connection failed: " . mysqli_connect_error());
}

Object-Oriented:

$mysqli = new mysqli("localhost", "username", "password", "database");
if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
}

Queries

Procedural:

$result = mysqli_query($mysqli, "SELECT * FROM table_name");
if ($result) {
    while ($row = mysqli_fetch_assoc($result)) {
        echo $row["column_name"];
    }
}

Object-Oriented:

$result = $mysqli->query("SELECT * FROM table_name");
if ($result) {
    while ($row = $result->fetch_assoc()) {
        echo $row["column_name"];
    }
}

Prepared Statements

Procedural:

$stmt = mysqli_prepare($mysqli, "SELECT * FROM table_name WHERE column_name = ?");
mysqli_stmt_bind_param($stmt, "s", $value);
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
while ($row = mysqli_fetch_assoc($result)) {
    echo $row["column_name"];
}
mysqli_stmt_close($stmt);

Object-Oriented:

$stmt = $mysqli->prepare("SELECT * FROM table_name WHERE column_name = ?");
$stmt->bind_param("s", $value);
$stmt->execute();
$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    echo $row["column_name"];
}
$stmt->close();

Inserting Data

Procedural:

$sql = "INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')";
if (mysqli_query($mysqli, $sql)) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
}

Object-Oriented:

$sql = "INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2')";
if ($mysqli->query($sql) === TRUE) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . $mysqli->error;
}

Updating Data

Procedural:

$sql = "UPDATE table_name SET column1 = 'value' WHERE condition";
if (mysqli_query($mysqli, $sql)) {
    echo "Record updated successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
}

Object-Oriented:

$sql = "UPDATE table_name SET column1 = 'value' WHERE condition";
if ($mysqli->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error: " . $sql . "<br>" . $mysqli->error;
}

Deleting Data

Procedural:

$sql = "DELETE FROM table_name WHERE condition";
if (mysqli_query($mysqli, $sql)) {
    echo "Record deleted successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($mysqli);
}

Object-Oriented:

$sql = "DELETE FROM table_name WHERE condition";
if ($mysqli->query($sql) === TRUE) {
    echo "Record deleted successfully";
} else {
    echo "Error: " . $sql . "<br>" . $mysqli->error;
}

Closing the Connection

Procedural:

mysqli_close($mysqli);

Object-Oriented:

$mysqli->close();

Common Functions Overview

Connecting: mysqli_connect, mysqli_connect_error, mysqli_close
Queries: mysqli_query, mysqli_fetch_assoc, mysqli_num_rows
Prepared Statemen: mysqli_prepare, mysqli_stmt_bind_param, mysqli_stmt_execute, mysqli_stmt_get_result, mysqli_stmt_close
Error Handling: mysqli_error, mysqli_stmt_error

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Regular Exprressions 🤯

RegEx syntax and functions

Syntax

$exp = "/cheatsheet/i";

$email = "admin@htmlcheatsheet.com";
if (preg_match('/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/', $email)) {
    echo "Valid email address";
} else {
    echo "Invalid email";
}

RegEx Functions

preg_match() - Returns 1 if the pattern was found in the string and 0 if not

preg_match_all() - Returns the number of times the pattern was found in the string, which may also be 0

preg_replace() - Returns a new string where matched patterns have been replaced with another string

Modifiers

i - Performs a case-insensitive search

m - Performs a multiline search (patterns that search for the beginning or end of a string will match the beginning or end of each line)

u - Enables correct matching of UTF-8 encoded patterns

Patterns

[abc] – Find one character from the options between the brackets

[^abc] – Find any character NOT between the brackets

[0-9] – Find one character from the range 0 to 9

Metacharacters

| - Find a match for any one of the patterns separated by | as in: cat|dog|fish

. - Find just one instance of any character

^ - Finds a match as the beginning of a string as in: ^Hello

$ - Finds a match at the end of the string as in: World$

\d - Find a digit

\s -Find a whitespace character

\b - Find a match at the beginning of a word like this: \bWORD, or at the end of a word like this: WORD\b

\uxxxx - Find the Unicode character specified by the hexadecimal number xxxx

Quantifiers

n+ - Matches any string that contains at least one n

n* - Matches any string that contains zero or more occurrences of n

n? - Matches any string that contains zero or one occurrences of n

n{x} - Matches any string that contains a sequence of X n’s

n{x,y} - Matches any string that contains a sequence of X to Y n’s

n{x,} - Matches any string that contains a sequence of at least X n’s

Grouping

Use parentheses ( ) to apply quantifiers to entire patterns or select parts of the pattern to be used as a match.

Examples

$password = "HTMLcheatSheet123!";
if (preg_match('/^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\d@$!%*?&]{8,}$/', $password)) {
    echo "Valid password";
} else {
    echo "Not strong enough";
}

Common Errors ❗

Tips to keep your code error-free.

Don't forget the semicolon!

Mismatched brackets ()
Incorrect quotes: " '
Undefined variables
Case sensitivity $Var ≠ $var
Incorrect function calls that does not exist or with incorrect parameters.

File Inclusion Errors

Using include or require with an incorrect file path. Use absolute paths or ensure relative paths are correct.

SQL Injection

Failing to sanitize user inputs can lead to SQL injection attacks. Use prepared statements and parameterized queries.

Error Handling

Use try-catch blocks and implementing proper error handling mechanisms.

Incorrect Array Usage

Check if array keys exist before accessing them.

Session Handling

Start sessions with session_start() and handle session variables correctly.

Output Buffering

Unintentional output before headers are sent can cause "headers already sent" errors. Use output buffering or ensure no output before header() calls.

Scope Issues

Variable scope misunderstandings, such as trying to access a variable outside its defined scope. Use global keyword or pass variables as function arguments.

Misconfigured php.ini

Incorrect settings in the php.ini file can lead to various issues. Ensure configuration settings are appropriate for your environment.

Deprecated Features

Using deprecated functions or features that may be removed in future PHP versions. Refer to the latest PHP documentation.

Incorrect Timezone Configuration

Set the default timezone using date_default_timezone_set().

Missing or Incorrect Encoding

Ensure correct character encoding is used, especially with multibyte strings.

Memory Limit Issues

Increase memory limit in php.ini or optimize code to use less memory.

Best Practices to Avoid Common PHP Errors

Use Error Reporting: Enable error reporting during development using error_reporting(E_ALL) and ini_set('display_errors', 1).
Code Reviews: Regular code reviews can catch errors early.
Testing: Write unit tests and integration tests to cover different code paths.
Documentation: Keep your code well-documented for easier maintenance and understanding.
Stay Updated: Keep up with the latest PHP versions and best practices.

PHP Filters ⚗️

Used to validate and filter data that is coming from insecure sources like user input.

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Define filters
    $filters = array(
        'email' => FILTER_VALIDATE_EMAIL,  
// Validate email address and optionally, more filters
    );
    // Apply filters to $_POST data
    $sanitized_inputs = filter_input_array(INPUT_POST, $filters);
    // Check if email is valid
    if ($sanitized_inputs['email'] === false) {
        echo "Invalid email address!";
    } else {
        // Use the sanitized input
        $email = $sanitized_inputs['email'];
        echo "Valid email address: " . $email;
    }
}

Filter Functions

filter_has_var() - To check if a variable of the specified type exists
filter_id() - Returns the ID belonging to a named filter
filter_input() - Retrieves a specified external variable by name and optionally filters it
filter_input_array() - Pulls external variables and optionally filters them
filter_list() - Returns a list of all supported filters
filter_var_array() - Gets multiple variables and optionally filters them
filter_var() - Filters a variable with a specified filter

Filter Constants

FILTER_VALIDATE_BOOLEAN - Validates a boolean
FILTER_VALIDATE_EMAIL - Certifies an e-mail address
FILTER_VALIDATE_FLOAT - Confirms a float
FILTER_VALIDATE_INT - Verifies an integer
FILTER_VALIDATE_IP - Validates an IP address
FILTER_VALIDATE_REGEXP - Confirms a regular expression
FILTER_VALIDATE_URL - Validates a URL
FILTER_SANITIZE_EMAIL - Removes all illegal characters from an e-mail address
FILTER_SANITIZE_ENCODED - Removes/Encodes special characters
FILTER_SANITIZE_MAGIC_QUOTES - Applies addslashes()
FILTER_SANITIZE_NUMBER_FLOAT - Removes all characters, except digits, +- and .,eE
FILTER_SANITIZE_NUMBER_INT - Gets rid of all characters except digits and + –
FILTER_SANITIZE_SPECIAL_CHARS - Removes special characters
FILTER_SANITIZE_FULL_SPECIAL_CHARS - Converts special characters to HTML entities
FILTER_SANITIZE_STRING - Removes tags/special characters from a string, same as: FILTER_SANITIZE_STRIPPED
FILTER_SANITIZE_URL - Rids all illegal characters from a URL
FILTER_UNSAFE_RAW - Do nothing, optionally strip/encode special characters
FILTER_CALLBACK - Call a user-defined function to filter data

Date and Time 📅

Working with date and time in PHP involves several useful functions from the date and DateTime classes

// Get current timestamp
$currentTimestamp = time();
// Format and display current date and time
echo "Current timestamp: " . $currentTimestamp . "<br>";
// Format date using date() function
echo "Current date: " . date("Y-m-d") . "<br>";
echo "Current time: " . date("H:i:s") . "<br>";
// Format date and time with specific timezone
date_default_timezone_set('America/New_York');
echo "Current date and time in New York: " . date("Y-m-d H:i:s");

Formatting

d - Days from 01 to 31
j - Days 1 to 31
D - Mon through Sun
l - Sunday through Saturday
N - 1 (for Mon) through 7 (for Sat)
w - 0 (for Sun) through 6 (for Sat)
m - Months, 01 through 12
n - Months, 1 through 12
F - January through December
M - Jan through Dec
Y - Four digits year (e.g. 2018)
y - Two digits year (e.g. 18)
L - Defines whether it’s a leap year (1 or 0)
a - am and pm
A - AM and PM
g - Hours 1 through 12
h - Hours 01 through 12
G - Hours 0 through 23
H - Hours 00 through 23
i - Minutes 00 to 59
s - Seconds 00 to 59

Functions

Hover your mouse for explanation:

checkdate, date_add, date_create_from_format, date_create, date_date_set, date_default_timezone_get, date_default_timezone_set, date_diff, date_format, date_get_last_errors, date_interval_create_from_date_string, date_interval_format, date_isodate_set, date_modify, date_offset_get, date_parse_from_format, date_parse, date_sub, date_sun_info, date_sunrise, date_sunset, date_time_set, date_timestamp_get, date_timestamp_set, date_timezone_get, date_timezone_set, date, getdate, gettimeofday, gmdate, gmmktime, gmstrftime, idate, localtime, microtime, mktime, strftime, strptime, strtotime, time, timezone_abbreviations_list, timezone_identifiers_list, timezone_location_get, timezone_name_from_abbr, timezone_name_get, timezone_offset_get, timezone_open, timezone_transitions_get, timezone_version_get

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Online PHP Cheat Sheet

Free online interactive PHP cheat sheet, perfect for both beginners and experienced programmers. Refresh your knowledge of PHP syntax and access the most commonly used code snippets at your fingertips. Download the PDF version here.

PHP (Hypertext Preprocessor) is a powerful and widely-used server-side scripting language designed for web development. Whether you're a beginner learning the basics or an experienced developer building complex applications, this PHP cheat sheet provides a quick reference to essential syntax, functions, and best practices. From variable handling and control structures to database interactions and advanced features like object-oriented programming, this cheat sheet covers fundamental concepts and practical examples to help you write efficient, secure, and maintainable PHP code. Use it to streamline your development process, troubleshoot issues, and deepen your understanding of PHP's capabilities.

The syntax-highlighted code snippets in this PHP Cheat Sheet were created with Hilite.me colorful template.

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➤

PHP Cheat Sheet

Editor 🖍

Basics 🚼

Hello World!

Comments

Defining Functions

Variables

var_dump

Objects

Escaping characters

Loops ➰

For Loop

Foreach Loop

While Loop

Do-While Loop

Useful Links 🔗

Ads

Operators 🔣

Assignment

Comparison

Logical

String

Arrays

Conditions ⤭

If statement

If - Else

If - Elseif - Else

Switch Statement

Ternary

Functions ♞

Parameters

Default Parameters

Return Values

Variable Scope

Anonymous Functions

Built-in Functions

Arrays ⧚

Indexed arrays

Associative arrays

Multidimensional arrays

Array Functions

Predefined Variables 🌎

$GLOBALS

Super Global Variables

PHP Forms ✍

$_GET

$_POST

$_REQUEST

Security 👮

Predefined Functions

boolval

isset

unset

debug_zval_dump

empty

floatval

get_defined_vars

get_resource_type

gettype

intval

is_array

Database 🖧

Connecting to DB

Procedural:

Object-Oriented:

Queries

Procedural:

Object-Oriented:

Prepared Statements

Procedural:

Object-Oriented:

Inserting Data

Procedural:

Object-Oriented:

Updating Data

Procedural:

Object-Oriented:

Deleting Data

Procedural:

Object-Oriented: