i got this error:
Function create_function() is deprecated in shipping.php
private 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
$compute = create_function("", "return (" . html_entity_decode($mathString) . ");" );
return 0 + $compute();
as far as i found out,create_function
is useless now. I considered all the suggestions on the web and came to the following conclusion
private 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
$compute = function() {
return (" . html_entity_decode($mathString) . ");
};
return 0 + $compute();
but this time it gives this error:
Undefined variable: mathString in shipping.php on line 1592 Warning: A non-numeric value encountered in shipping.php
Also i tried return part like this ways but it is not working
return html_entity_decode($mathString);
return $html_entity_decode($mathString);
Where am I going wrong? Can you help me please?
Use an anonymous function witheval()
.
$compute = function() use ($mathString) { eval("return (" . html_entity_decode($mathString) . ");"; }
You need theuse
option to make the variable available in the function.
Actually, there's no need for the function in the first place. You can just useeval()
directly.
private function calculate_string( $mathString ) {
$mathString = trim($mathString); // trim white spaces
$mathString = preg_replace ('[^0-9\+-\*\/\(\) ]', '', $mathString); // remove any non-numbers chars; exception for math operators
eval('return 0 + (' . html_entity_decode($mathString) . ');')
}
I have a feeling the original programmer either didn't know how to useeval()
, or heard the advice thateval()
is dangerous. But creating a function with the dynamic content is just as dangerous.
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