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<?php function calculate_string( $mathString ) { $mathString = trim($mathString); // trim white spaces $mathString = preg_replace ('#[^0-9\+-\*\/\(\) ]#', '', $mathString); // remove any non-numbers chars; exception for math operators $compute = create_function("", "return (" . $mathString . ");" ); return 0 + $compute(); } $string = " (1 + 1) * (2 + 2)"; echo calculate_string($string); // outputs 8
Output for git.master, git.master_jit, rfc.property-hooks
Warning: preg_replace(): Compilation failed: range out of order in character class at offset 9 in /in/34J44 on line 4 Fatal error: Uncaught Error: Call to undefined function create_function() in /in/34J44:5 Stack trace: #0 /in/34J44(10): calculate_string(NULL) #1 {main} thrown in /in/34J44 on line 5
Process exited with code 255.

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