PHP Fundamentals Cheat Sheet by mkpeacock

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

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

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

// 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();
}

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

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

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