Why does the pre/post increment operator behave wrongly?


Last Update : 2023-09-22 UTC 08:30:02 AM

Answers of > Why does the pre/post increment operator behave wrongly?

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Operator precedence and associativity only determine how expressions are grouped, they do not specify an order of evaluation. PHP does not (in the general case) specify in which order an expression is evaluated and code that assumes a specific order of evaluation should be avoided, because the behavior can change between versions of PHP or depending on the surrounding code.

$a = 1;
echo $a + $a++; // may print either 2 or 3

$i = 1;
$array[$i] = $i++; // may set either index 1 or 2

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