Web Reference: Learn how to create, use and output PHP variables, which are containers for storing data. Find out the rules, types and examples of PHP variables, and how to get the data type of a variable. 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. Apr 11, 2025 · To declare a variable in PHP, you simply assign a value to it using the $ symbol followed by the variable name. PHP variables are case-sensitive and must start with a letter or an underscore, followed by any number of letters, numbers, or underscores.
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