PHP Fundamentals Cheat Sheet

A Programming › PHP cheat sheet in English by mkpeacock

Fundamentals of PHP

PHP Development Programming Web Beginner

50,955 views 14,750 downloads 25 Jul 2012 History

PRs

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Basic Syntax

Files start with	<?php
Single line comment	// a comment
Multi-line comment	/ comment /
End of instruction	;
Include code from another file	require_once('some_file.php');

Classes and Objects

class SomeClass {
private $property;
public $anotherProperty;
protected $yetAnotherProperty = null;

public function __construct($arg=null)
{
$this->property = $arg;
}

public function someMethod()
{
echo “Hi”;
}

public function getProperty()
{
return $this->property;
}

public function setProperty( $p )
{
$this->property = $p;
}

}

$myObject = new SomeClass( “123” );
echo $myObject->getProperty(); // 123
$myObject->property; // ERROR:private

Variables

$variableName;

$variableName = "Some String";

$variableName = 'Some String';

$variableName = strtoupper('text');

$variableName = 5;

$variable = "Some {$otherVariable} info";

echo $variableName; // output

$newVar = $var1 . $var2; // concatenation

Functions

function multiply($arg1, $arg2)
{
return $arg * $arg2;
}

$param = 4;
$param2 = 8;
$answer = multiply($param, $param2);

Control Structure: IF

// if something is true do something else
if( $something == true ) {
doSomethingElse();
} elseif( $something == false ) {
// however, if something is false, do something
doSomething();
} else {
// otherwise, lets do nothing
doNothing();
}

Control Structure: Loops

foreach( $myArray as $key => $value ) {
echo “My array has the value {$value} stored against the key {$key}<br />”;
}

while( someCondition == true ) {
echo ‘hello’;
}

Numerical Operations

Addition	$variable = $variable + 5;
Subtraction	$variable = $variable - 5;
Multiplication	$variable = $variable * 5;
Division	$variable = $variable / 5;

Arrays

Create	$myArray = array();
Push into	$myArray[] = "Something";
Push to associative	$myArray['key'] = "Value";
Create numeric	$myArray = array('value', 'value2');
Create associative	$a = array('key'=>'val');
Print from numeric	echo $myArray[0];
Print from associative	echo $myArray['key'];
Associative arrays	Keys are strings
Numeric arrays	Keys are numbers: 0,1,2,3,4

Control Structure: Switch

switch( $someVariable ) {
case 1:
echo “Some variable equals 1”;
break;
case “cheese”
echo “Some variable equals cheese”;
break;
default:
echo “No idea”;
break;
}

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Comments (1)

Sergey 13:00 17 Sep 2015

There is a mistake in multiline comment. Should be /* */