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<?php $a = array( 'red', 'green', 'blue' ); foreach ( $a as $k => $c ) { if ($c == 'red') { $a[$k] = 'purple'; } } var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(6) "purple" [1]=> string(5) "green" [2]=> string(4) "blue" }

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