How to convert string to multidimensional array in php

How to convert a string into a multi-dimensional array in php: first define a string that needs to be converted into a multi-dimensional array; then split the string through the explode function and return an array composed of strings; finally pass "print_r" Just output the conversion result.

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php Convert string to two-dimensional array

First method:

<?php
$a = &#39;a1|a2|a3|a4|b1|b2|b3|b4&#39;;
$arr = explode(&#39;|&#39;, $a);
//print_r($arr);
$test = array();
foreach($arr as $value)
{
    //echo $value{0}.&#39;<br>&#39;;
    $test[$value{0}][] = $value;
}
echo "<pre class="brush:php;toolbar:false">";
print_r($test);
echo "

Second method:

array_chunk(explode('|', $a), 4);

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