<?php $a = array( array( array( 'plm1' => "1", 'plm2' => "2", 'plm3' => "3", ), 'plm1' => "4", 'plm3' => "5", 'plm4' => "6", ), array( 'plm1' => "2", 'plm3' => "3", 'plm4' => "4", ), ); print_r(array_column($a, "plm1"));
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