The list function in PHP

Today in the development of a method to see the list language structure, just beginning to think it is a function in PHP!

List () is used to assign values to a set of variables in a single operation.

Note: List () is used only for arrays of numeric indexes and assumes that the numeric index starts at 0.

Description

List () assigns a value to a set of variables using the elements in the array.

Note that, like array (), list () is actually a language structure, not a function.

Such as:

<?php
$my _array = Array (' Dog ', ' Cat ', ' Horse ');
List ($a, $b, $c) = $my _array;
Echo ' I have several animals, a '. $a. ', a '. $b. ' and a '. $c;
?>

The results are as follows and can be output normally

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When an array is not a numeric array but an associative array, such as:

<?php
$my _array = Array (' a ' = = ' Dog ', ' b ' = ' Cat ', ' c ' = ' Horse ');
List ($a, $b, $c) = $my _array;
Echo ' I have several animals, a '. $a. ', a '. $b. ' and a '. $c;
?>

The result will be an error.

650) this.width=650; "Src=" http://images2015.cnblogs.com/blog/1043589/201611/ 1043589-20161118145321185-1621094066.png "/>

When using an indexed array is as follows:

<?php
$my _array = Array (0=> ' Dog ',1=> ' Cat ',2=> ' Horse ');
List ($a, $b, $c) = $my _array;
Echo ' I have several animals, a '. $a. ', a '. $b. ' and a '. $c;
?>

This is a normal output when the code is changed to

<?php
$my _array = Array (1=> ' Dog ',2=> ' Cat ',3=> ' Horse ');
List ($a, $b, $c) = $my _array;
Echo ' I have several animals, a '. $a. ', a '. $b. ' and a '. $c;
?>

The output is as follows

650) this.width=650; "Src=" http://images2015.cnblogs.com/blog/1043589/201611/ 1043589-20161118150139138-2090392627.png "/>

The list function in PHP