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Foreach php1/29/2024 In the last loop, $value is therefore equivalent to $array.Īfter the foreach ends, $value continues to be accessible (because foreach does not have its own scope). In the first foreach we use the &$value syntax, so $value is set as a reference to each array’s element. The following example clearly shows the problem:Īfter the second foreach loop, the last element inside the array has changed. Therefore, strict comparing it to a string will always return FALSE. Here’s the thing: if, and only if, the key is a numeric literal, then it is automatically converted into an integer at the start of the loop. Inside foreach loops you can access every key/value pair of the array you are iterating, and sometimes you may need to compare the key with some other value. Strict comparison operators are very useful because they can differentiate between values like 0, FALSE or NULL, while loose comparison operators (llike “ =“) consider them equivalent. While type juggling can be convenient, it’s important to always consider the variable type we are dealing with, expecially when using strict comparison operators (like “ =“). In both cases, even if the type is different, a statement like $a = $a + 1 makes $a becomes an integer. $a = 1 makes $a an integer, and $a = ‘1’ makes $a a string. Actually, each variable does have its own type, but it can change over time. This doesn’t mean that PHP doesn’t have types. One of these is type juggling: the PHP interpreter automatically sets variable’s types depending on the context and on which operators are used. PHP has some user friendly features that should help beginners and less experienced developers code more easily.
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