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For example given code:
if(strstr($key, ".")){
// do something
}
strstr returns a string, how can it be used as boolean? How does it turn true or false?
Citing from the PHP docu:
So the boolean check is basically, whether the substring (the
.in this case) is found at all.Any other value this function can return is a non-empty string, which will be evaluated to truthy (See this entry in docu.)