What does php traversal mean?

PHP traversal refers to traversing an array, which means taking out the elements in the array. PHP traversal statements such as "foreach($arr_m as $value){foreach($value AS $key => $val){ ...}}".

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php traversal refers to traversing the array

That's it Take out the elements from the array. .

For example

$arr = array(
'a' => 1,
'b' => 2,
'c' => 3,
'd' => 4
);
foreach($a AS $k => $v)
{
echo $k.'的值是'.$v;
}

This is a 2-dimensional array, and a double-layer loop must be used. .

If you want to output more content, you can try my modified code.

<?php
$arr_m = array(
array(&#39;id&#39;=>23,&#39;name&#39;=>&#39;小红&#39;,&#39;age&#39;=>23),
array(&#39;id&#39;=>15,&#39;name&#39;=>&#39;小白&#39;,&#39;age&#39;=>21),
array(&#39;id&#39;=>12,&#39;name&#39;=>&#39;小黑&#39;,&#39;age&#39;=>31),
array(&#39;id&#39;=>2,&#39;name&#39;=>&#39;小二&#39;,&#39;age&#39;=>31)
);
$arr_id = array();
$arr_age = array();
foreach($arr_m as $value)
{
foreach($value AS $key => $val)
{
echo $key.&#39;是&#39;.$val .&#39;<br />&#39;;
}
echo &#39;<p></p>&#39;;
}
?>

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