mkpeacock php fundamentals

Prévia do material em texto

PHP Fundamentals Cheat Sheet
by mkpeacock via cheatography.com/1456/cs/489/
Basic Syntax
Files start with <?php
Single line comment // a comment
Multi-line comment / comment /
End of instru ​ction ;
Include code from
another file
requir ​e_o ​nce ​('s ​ome ​_fi ​l
e.p ​hp');
Classes and Objects
class SomeClass {
 ​ ​ ​ ​private $property;
 ​ ​ ​ ​public $anoth ​erP ​rop ​erty;
 ​ ​ ​ ​pro ​tected $yetAn ​oth ​erP ​roperty = null;
 ​ ​ ​ ​public function __cons ​tru ​ct( ​$ar ​g=null)
{
 ​ ​ ​ ​$th ​is- ​>pr ​operty = $arg;
}
public function someMe ​thod()
{
 ​ ​ ​ echo “Hi”;
}
public function getPro ​perty()
{
 ​ ​ ​ ​return $this- ​>pr ​operty;
}
public function setPro ​perty( $p )
{
 ​ ​ ​ ​$th ​is- ​>pr ​operty = $p;
}
}
$myObject = new SomeClass( “123” );
echo $myObj ​ect ​->g ​etP ​rop ​erty(); // 123
$myObj ​ect ​->p ​rop ​erty; // ERROR: ​private
 
Variables
$varia ​ble ​Name;
$varia ​bleName = "Some String ​";
$varia ​bleName = 'Some String';
$varia ​bleName = strtou ​ppe ​r(' ​text');
$varia ​bleName = 5;
$variable = "Some {$othe ​rVa ​riable} info";
echo $varia ​ble ​Name; // output
$newVar = $var1 . $var2; // concat ​enation
Functions
function multip ​ly( ​$arg1, $arg2)
{
 ​ ​ ​ ​return $arg * $arg2;
}
$param = 4;
$param2 = 8;
$answer = multip ​ly( ​$param, $param2);
Control Structure: IF
// if something is true do something else
if( $something == true ) {
 ​ ​ ​ ​doS ​ome ​thi ​ngE ​lse();
} elseif( $something == false ) {
 ​ ​ ​ // however, if something is false, do
something
 ​ ​ ​ ​doS ​ome ​thi ​ng();
} else {
 ​ ​ ​ // otherwise, lets do nothing
 ​ ​ ​ ​doN ​oth ​ing();
}
Control Structure: Loops
foreach( $myArray as $key => $value ) {
 ​ ​ ​ echo “My array has the value {$value} stored
against the key {$key} ​<br />”;
}
while( someCo ​ndition == true ) {
 ​ ​ ​ echo ‘hello’;
}
 
Numerical Operations
Addition $variable = $variable + 5;
Subtra ​ction $variable = $variable - 5;
Multip ​lic ​ation $variable = $variable * 5;
Division $variable = $variable / 5;
Arrays
Create $myArray = array();
Push into $myArray[] = " ​Som ​eth ​ing ​";
Push to
associ ​ative
$myArr ​ay[ ​'key'] = " ​Val ​ue";
Create numeric $myArray = array( ​'va ​lue',
'value2');
Create
associ ​ative
$a = array( ​'ke ​y'= ​>'v ​al');
Print from
numeric
echo $myArr ​ay[0];
Print from
associ ​ative
echo $myArr ​ay[ ​'key'];
Associ ​ative
arrays
Keys are strings
Numeric arrays Keys are numbers:
0,1,2,3,4
Control Structure: Switch
switch( $someV ​ariable ) {
 ​ ​ ​ case 1:
 ​ ​ ​ ​ ​ ​ ​ echo “Some variable equals 1”;
 ​ ​ ​ ​ ​ ​ ​ ​break;
 ​ ​ ​ case “cheese”
 ​ ​ ​ ​ ​ ​ ​ echo “Some variable equals cheese”;
 ​ ​ ​ ​ ​ ​ ​ ​break;
 ​ ​ ​ ​def ​ault:
 ​ ​ ​ ​ ​ ​ ​ echo “No idea”;
 ​ ​ ​ ​ ​ ​ ​ ​break;
}
By mkpeacock
cheatography.com/mkpeacock/ 
Published 25th July, 2012.
Last updated 5th June, 2014.
Page 1 of 1.
 
Sponsored by Readability-Score.com
Measure your website readability!
https://readability-score.com
	PHP Fundamentals Cheat Sheet - Page 1
	Basic Syntax
	Variables
	Numerical Operations
	Arrays
	Classes and Objects
	Functions
	Control Structure: IF
	Control Structure: Switch
	Control Structure: Loops