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run code in 300+ PHP versions simultaneously
<?php $a = array( 1,1,1,1,2,1,1,1,1,2,1,1,1,1,2 ); global $b; $b = 2; function c( $d ){ global $b; return $d==$b; } var_dump( array_filter( $a, 'c' ) );

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