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ctype_alnum(string|int $text): bool
Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.
Returns TRUE if every character in text is either a letter or a digit, FALSE otherwise.
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ctype_alpha(string|int $text): bool
Returns TRUE if every character in text is a letter, FALSE otherwise.
Returns TRUE if every character in text is a letter, FALSE otherwise.
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ctype_cntrl(string|int $text): bool
Returns TRUE if every character in text is a control character from the current locale, FALSE otherwise.
Returns TRUE if every character in text is a control character from the current locale, FALSE otherwise.
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ctype_digit(string|int $text): bool
Returns TRUE if every character in the string text is a decimal digit, FALSE otherwise.
Returns TRUE if every character in the string text is a decimal digit, FALSE otherwise.
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ctype_graph(string|int $text): bool
Returns TRUE if every character in text is printable and actually creates visible output (no white space), FALSE…
Returns TRUE if every character in text is printable and actually creates visible output (no white space), FALSE otherwise.
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ctype_lower(string|int $text): bool
Returns TRUE if every character in text is a lowercase letter.
Returns TRUE if every character in text is a lowercase letter.
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ctype_print(string|int $text): bool
Returns TRUE if every character in text will actually create output (including blanks). Returns FALSE if text contains…
Returns TRUE if every character in text will actually create output (including blanks). Returns FALSE if text contains control characters or characters that do not have any output or control function at all.
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ctype_punct(string|int $text): bool
Returns TRUE if every character in text is printable, but neither letter, digit or blank, FALSE otherwise.
Returns TRUE if every character in text is printable, but neither letter, digit or blank, FALSE otherwise.
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ctype_space(string|int $text): bool
Returns TRUE if every character in text creates some sort of white space, FALSE otherwise. Besides the blank character…
Returns TRUE if every character in text creates some sort of white space, FALSE otherwise. Besides the blank character this also includes tab, vertical tab, line feed, carriage return and form feed characters.
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ctype_upper(string|int $text): bool
Returns TRUE if every character in text is an uppercase letter.
Returns TRUE if every character in text is an uppercase letter.
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ctype_xdigit(string|int $text): bool
Returns TRUE if every character in text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] …
Returns TRUE if every character in text is a hexadecimal 'digit', that is a decimal digit or a character from [A-Fa-f] , FALSE otherwise.
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