<?php function calculate_string( $mathString ) { $mathString = trim($mathString); // trim white spaces $mathString = preg_replace('#[^0-9\+\-\*\/\(\) ]#', '', $mathString); // remove any non-numbers chars; exception for math operators var_dump($mathString); $compute = create_function("", "return (" . $mathString . ");" ); return 0 + $compute(); } $string = " 4141.58-3878.96-262.62"; echo calculate_string($string); // outputs 8
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