(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
ctype_digit — Check for numeric character(s)
Checks if all of the characters in the provided string,
text
, are numerical.
text
The tested string.
Note:
If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.
Returns true
if every character in the string
text
is a decimal digit, false
otherwise.
When called with an empty string the result will always be false
.
Example #1 A ctype_digit() example
<?php$strings = array('1820.20', '10002', 'wsl!12');foreach ($strings as $testcase) { if (ctype_digit($testcase)) { echo "The string $testcase consists of all digits.\n"; } else { echo "The string $testcase does not consist of all digits.\n"; }}?>
The above example will output:
The string 1820.20 does not consist of all digits. The string 10002 consists of all digits. The string wsl!12 does not consist of all digits.
Example #2 A ctype_digit() example comparing strings with integers
<?php$numeric_string = '42';$integer = 42;ctype_digit($numeric_string); // truectype_digit($integer); // false (ASCII 42 is the * character)is_numeric($numeric_string); // trueis_numeric($integer); // true?>