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<?php function _convertToCamelCase(array $matches) { return ucfirst($matches[1]); } $key = 'valami_underscored_cucc'; echo preg_replace_callback( '/_(\w)/', array('_convertToCamelCase'), $key);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, array callback must have exactly two members in /in/huDCK:10 Stack trace: #0 /in/huDCK(10): preg_replace_callback('/_(\\w)/', Array, 'valami_undersco...') #1 {main} thrown in /in/huDCK on line 10
Process exited with code 255.

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