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function that see if a variable contains something?

hi,
I was wondering if there is a function that sees if a variable contains something.

If you know please tell me what the function is called so I can look it up at php.net


thank you. hi,
I was wondering if there is a function that sees if a variable contains something.

If you know please tell me what the function is called so I can look it up at php.net


thank you.

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