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run code in 150+ php & hhvm versions
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<?php $tokens = [ ':rr'=>5, ':tipo'=>'\[A-Z]' ]; $regex = '/#([a-zA-z0-9_]+)(:[a-zA-Z]+)/'; $pattern = '#nombre:tipo'; //echo preg_replace($regex, "(?<$1>".$tokens[(int) ${2}].")", $pattern); echo preg_replace_callback($regex, function (array $matches) { echo "(?<${matches[1]}>$tokens[$matches[2])"; }, $pattern);
Output for 5.4.0 - 5.4.23
Parse error: syntax error, unexpected '[', expecting ']' in /in/fPmNX on line 18
Process exited with code 255.
Output for 5.3.0 - 5.3.28
Parse error: syntax error, unexpected '[' in /in/fPmNX on line 3
Process exited with code 255.