PHP Arrays Cheat Sheet

A Programming › PHP cheat sheet in English by shirM

simple cheatsheet for php array functions, declaration.

4,033 views 805 downloads 7 May 2023 History

PRs

Declaration

explicit location	`<?php $printer[0] = "Laserjet 2001"; $printer[1] = "LMP1724fast";`
implicit location	`<?php $printer[] = "Laserjet 2001"; $printer[] = "LMP1724fast";`

Associative Arrays

<?php
    $printer['R&B PRINTERS']= "Laserjet 2002";
    $printer['Jackson Printers'] = "J2001Laserjet";
    print_r($printer);
    
    //result
    array (
            'R&B PRINTERS' => "Laserjet 2002",
            'Jackson Printers' => "J2001Laserjet",
     )
?>

with associative arrays, you can reference the items in an array by name rather than by number.

Multidimensional Arrays

<?php
 $products = array(
     'pens' => array(
         'ball' =>  "Ball Point",
         'hilite' =>  "Highlighters",
         'marker' => "Markers"),
      'misc' => array(
         'tape' =>  "Sticky Tape",
         'glue' =>  "Adhesives",
         'clips' => "Paperclips"
        )
 );

Assignment using the array Keyword

`<?php {{nl}}$p1 = array("China", "Russia", "Austria", "Turkey");  {{nl}}$p2 = array {{nl}} ({{nl}} 'china' => "Beijing", {{nl}}  'Russia' => "Moscow" ,{{nl}}  'Austria' => "Vienna", {{nl}}  'Turkey' => "Ankara" {{nl}} );

The for..each as loop

<?php
 $paper = array("Copier", "Inkjet", "Laser", "Photo");
 $j = 0;
 foreach($paper as $item)
 {
 echo "$j: $item<br>";
 ++$j;
 }
?>

Functions

is_array()

echo (is_array($products)) ? "Is an array" : "Is not an array";

count()

echo count($products);

sort()

sort($products);
sort($products, SORT_NUMERIC);
sort($products, SORT_STRING);

shuffle()

shuffle($cards);

explode()

<?php  
$temp = explode(' ', "This is a sentence with seven words");
 print_r($temp); 
?>

extract()

extract($_GET);

compact()

<?php
$planet = "Gallifrey";
$system = "Gridlock";
$constellation = "Kasterborous";
$contact = compact 'planet', 'system', 'constellation');

use compact, the inverse of extract, to create
an array from variables and their values.

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