How to convert an array into a set of variables in php

In PHP, list() can be used to convert an array into a set of variables. The syntax is "list(variable 1, variable 2, variable 3....) = $array;". The list() function can assign the values ​​in an array to a set of variables in a single operation. The number of array elements needs to be greater than or equal to the number of parameters in list().

The operating environment of this tutorial: windows7 system, PHP5.5 version, DELL G3 computer

In php, you can use list() to Convert an array into a set of variables.

list() can assign the values ​​​​in an array to a set of variables. Like array(), it is not a real function, but a language structure. list() can assign values ​​to a set of (multiple) variables in a single operation.

Grammar format:

list($var1 [, $val2, ...])=$array;

Parameter description:

• ##$val1, $val2... is a set of variables to be assigned, and multiple variables are separated by commas , .

• $array is the array for assignment.

  
  

Note: list() can only be used to index arrays, and the index must start from 0. In PHP5, list() starts assigning values ​​from the rightmost parameter; in PHP7, list() starts assigning values ​​from the leftmost parameter.

Example:

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,45,9);
list($a, $b, $c) = $arr;
echo $a."<br>";
echo $b."<br>";
echo $c."<br>";
?>

It can be seen that in the above example, the array is converted into a set of variables ($a, $ b, $c).

Note: The number of array elements can be greater than or equal to the number of parameters in list(), but cannot be less than, otherwise an error will be reported:

<?php
$arr=array(1,45,9,4,5,6);
list($a, $b, $c) = $arr;
echo $a."<br>";
echo $b."<br>";
echo $c."<br>";
?>

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(1,45,9);
list($a, $b, $c, $d) = $arr;
echo $a."<br>";
echo $b."<br>";
echo $c."<br>";
?>

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