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<?php //echo ['p1', 'p2', 'p3'].map(function($name){ return ':' . $name; }).join(','); echo var_dump(array_map(function($name) { return ':' . $name; }, ['p1', 'p2', 'p3'])); ?>
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(3) ":p1" [1]=> string(3) ":p2" [2]=> string(3) ":p3" }

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