How to implement variable with value operator statement in IF statement? - php

Question

How to implement variable with value operator statement in IF statement ?
if ($dcustomer['mix_max']=='MIN') {
$operator=">=";
} elseif ($dcustomer['mix_max']=='MAX') {
$operator="<=";
}
if ($djml['Tamount'] ."$operator". $dcustomer['limit_maksimal']){
}

Answer 1

<?php
$dcustomer = array("mix_max"=>"MIN","limit_maksimal"=>2);
$djml = array("Tamount"=>"");
if ($dcustomer['mix_max']=='MIN') {
$operator=">=";
} elseif ($dcustomer['mix_max']=='MAX') {
$operator="<=";
}
echo $djml['Tamount'] .$operator. $dcustomer['limit_maksimal'];

Answer 2

You cannot (well, you could if you used eval(), which should be avoided for obvious reasons).
But the same effect can be achieved with a multiplier:
switch ($dcustomer['mix_max']) {
case 'MIN':
$multiplier = 1;
break;
case 'MAX':
$multiplier = -1;
break;
default:
// Always prepare for the unknown :-)
throw new \Exception("Unknown operator");
}
if ($djml['Tamount']*$multiplier >= $dcustomer['limit_maksimal']*$multiplier) {
...
}
But I think it would be clearer and more flexible:
$condition = null;
switch ($dcustomer['mix_max']) {
case 'MIN':
$condition = ($djml['Tamount'] >= $dcustomer['limit_maksimal']);
break;
case 'MAX':
$condition = ($djml['Tamount'] <= $dcustomer['limit_maksimal']);
break;
default:
// Always prepare for the unknown :-)
throw new \Exception("Unknown operator");
}
if ($condition) {
...
}