PHP's Ctype Functions
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<?php | |
// Check if input is alphanumeric (letters and numbers) | |
ctype_alnum('abcdef1234'); // This returns TRUE | |
ctype_alnum('£%^&ab2'); // This on the otherhand returns FALSE | |
// check if input is alpha (letters) | |
ctype_alpha('dssfsdf'); // returns TRUE | |
ctype_alpha('12345dssfsdf'); // Returns FALSE | |
?> |
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<?php | |
// Check if the input is numeric | |
ctype_digit('1234'); // TRUE | |
ctype_digit('1as2d34f'); // FALSE | |
// Uppercase | |
ctype_upper('HELLO'); // TRUE | |
ctype_upper('hElLo'); // FALSE | |
// Lowercase | |
ctype_lower('hello'); // TRUE | |
ctype_lower('HeLLo'); // FALSE | |
?> |
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