<?php $json_string = '{"options": [ { "optionID" : 123 }, { "optionID" : 456 }, { "optionID" : 789 } ]}'; $idpassed = 123; $options = json_decode($json_string, 1)['options']; if (array_search($idpassed, array_column($options, 'optionID')) !== FALSE) { echo "the option exists!"; } else { echo "the option does not exist!"; }
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