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<?php function foo($arg){ $var = 'check:'.$arg; echo $var; } preg_replace('/a/', foo("$1"), 'a');
Output for git.master, git.master_jit, rfc.property-hooks
check:$1 Deprecated: preg_replace(): Passing null to parameter #2 ($replacement) of type array|string is deprecated in /in/Xj8kF on line 6

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