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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$test = '[{"key":"parent"},{"key":"pagetitle"},{"key":"longtitle"},{"key":"menuindex"},{"key":"tv.title"},{"key":"tv.combo"},{"key":"seo_title"},{"key":"seo_desc"},{"key":"gallery"}]';
$test = json_decode($test,1);
$test = array_column($test, key');
print_r($test);