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When you declare a variable in PHP, you don’t need to define its type - you just declare it. If variables are used as part of a comparison, in order to compare them, PHP needs to guess what those variables represent. After making this guess, PHP will convert the variables to some common data type to then perform the actual comparison.
This can result in unexpected behaviour, which as we’ve seen before and from a security is perspective is almost always a bad idea.
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