Last Updated: March 30, 2016
· nicolaskempfpro
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PHP In-depth : Variables


In PHP, variables start with a $ then a name following a specific pattern similar to all other PHP labels :

  • first character : a letter, from a to z in lower case or upper case, plus all ASCII characters from codes 127 (0x7f) to 255 (0xff), or an underscore (_).
  • then : a group of letters (defined as above), underscores, or numbers.

We can use the following regular expression to represent them :


Source :

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