PHP:Sorting an Array

PHP:Arrays

PHP:Creating an Array

PHP:Accessing an Array

PHP:Looping over an Array

PHP:Filtering an Array

PHP:Sorting an Array

PHP:Mapping an Array

PHP:Reducing an Array

You can sort an array in PHP with sort

Sort an array

The function sort can be used if the sort is simple:

Sort the list 2,7,5,4.

.

<? $x = array(2,7,5,4); sort($x); foreach ($x as $y) echo "$y\n"; ?>

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test text

 

 

 

 

Sort an array in reverse

We use the function rsort:

Sort the list 2,7,5,4 in reverse.

.

<? $x = array(2,7,5,4); rsort($x); foreach ($x as $y) echo "$y\n"; ?>

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test text

 

 

 

 

Sort an array using a custom comparator

You can create your own comparator. This mens that you decide how the sort is to be done. It is a function that returns a negative, zero or a positive integer depending on how the first argument (let's call $o1) compares to the second argument (let's call $o2).

return -1 (or any negative number) if $o1 comes before $o2
return  0 if $o1 and $o2 are the same
return  1 (or any positive number) if $o1 comes after $o2

.

<? function myComp($o1, $o2) { // sorts in ascending order of string length return strlen($o1) - strlen($o2); } $a = array("one","two","three","four","five"); usort($a, "myComp"); foreach ($a as $y) echo "$y\n"; ?>

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test text