Summary of PHP array traversal methods

Arrays are divided into two categories in PHP: numeric index arrays and associative arrays.
The numerical index array is the same as the array in C language, the subscripts are 0, 1, 2...
The subscript of the associative array may be of any type, similar to hash, map and other structures in other languages.
The following introduces three methods of traversing associative arrays in PHP:
Method 1: foreach

<?php 
$sports = array( 
&#39;football&#39; => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
foreach ($sports as $key => $value) { 
echo $key.": ".$value."<br />"; 

}
?> 

Output results:
football: good
swimming: very well
running: not good

Method 2, each

<?php 
$sports = array( 
&#39;football&#39; => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
while ($elem = each($sports)) { 
echo $elem['key'].": ".$elem['value']."<br />"; 

}
?> 

Method 3: list & each

<?php 
$sports = array( 
&#39;football&#39; => 'good', 
'swimming' => 'very well', 
'running' => 'not good'); 
while (list($key, $value) = each($sports)) { 
echo $key.": ".$value."<br />"; 
?> 

The above has introduced a summary of the PHP array traversal method, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.