Use of as keyword in php

 

 

 

 

 

 

 

 

 

 

 

foreach

(PHP 4, PHP 5)

The foreach construct provides an easy way to iterate over arrays. foreach works only on arrays and objects, and will issue an error when you try to use it on a variable with a different data type or an uninitialized variable. There are two syntaxes:

foreach (array_expression as $value)
    statement
foreach (array_expression as $key => $value)
    statement

The first form loops over the array given by array_expression. On each iteration, the value of the current element is assigned to $value and the internal array pointer is advanced by one (so on the next iteration, you’ll be looking at the next element).

The second form will additionally assign the current element’s key to the $key variable on each iteration.

It is possible to customize object iteration.

Example of as keyword in php

<?php
$arr = array(1, 2, 3, 4);
foreach ($arr as &$value) {
$value = $value * 2;
}
// $arr is now array(2, 4, 6, 8)
unset($value); // break the reference with the last element
?>

Example of as keyword in php

Referencing $value is only possible if the iterated array can be referenced (i.e. if it is a variable). The following code won’t work:

<?php
foreach (array(1, 2, 3, 4) as &$value) {
$value = $value * 2;
}
?>