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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$arr1 = [
["url" => "/1/1/1", "cnt" => "1"],
["url" => "/2/2/2", "cnt" => "1"],
["url" => "/3/3/3", "cnt" => "1"]
];
$arr2 = [
["url" => "/2/2/2", "cnt" => "1"],
["url" => "/4/4/4", "cnt" => "1"]
];
$url1arr = array_column($arr1, 'url', 'url');
foreach ($arr2 as $arr2s) {
//Если не нашел будет действие
if (!isset($url1arr[$arr2s['url']])) {
var_dump ($arr2s);
}
}