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<?php if (ctype_alnum($string)) { echo "This string totally works"; } else { echo "And this one not so much"; }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $string in /in/GqGfM on line 2 Deprecated: ctype_alnum(): Argument of type null will be interpreted as string in the future in /in/GqGfM on line 2 And this one not so much

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