Web Reference: PHP automatically associates a data type to the variable, depending on its value. Since the data types are not set in a strict sense, you can do things like adding a string to an integer without causing an error. In order to use variable variables with arrays, an ambiguity problem has to be resolved. That is, if the parser sees $$a [1] then it needs to know if $a [1] was meant to be used as a variable, or if $$a was wanted as the variable and then the [1] index from that variable. In PHP, the primary variable types are string, integer, float (also known as double), Boolean, array, object, null, and resource. Below is the example of each type of variable.
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Last Updated: April 7, 2026
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