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<?php function normalizeHeaders(&$headers) { // Normalize headers array_walk( $headers, function (&$val, &$key) { $key = ucfirst(strtolower($key)); $val = ucfirst(strtolower($key)) . ': ' . $val; } ); } $headers = array('foo' => 'bar'); normalizeHeaders($headers); var_dump($headers);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/V8SRv on line 6 array(1) { ["foo"]=> string(8) "Foo: bar" }

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