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.

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

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