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PHP Fundamentals Cheat Sheet by

Fundamentals of PHP
php     development     programming     web     beginner

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

Sergey Sergey, 13:00 17 Sep 15

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

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