Check if a variable is a number or a numeric string. This is much the same as (is_numeric) but will only return true for any number of digits with no decimal part and optional exponential part what so ever.
isnum
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Quote
isnum ( mixed $value )
Parameters
value
The value to check
Return Values
This function will return true if the $value is a number of digits with no decimal part or optional exponential part what so ever and false on everything else.
Example 1
Code
<?php
$value = "abc123";
if (isnum($value)) {
echo "This is a number of digits!";
} else {
echo "This is not a number of digits!";
}
?>Here we will check the string $value it it is a number of digits
Output to Example 1
Quote
This is not a number of digits!
Example 2
Code
<?php
$value = "123";
if (isnum($value)) {
echo "This is a number of digits!";
} else {
echo "This is not a number of digits!";
}
?>
Output to Example 2
Quote
This is a number of digits!
Example 3
Code
<?php
$value = "123.456";
if (isnum($value)) {
echo "This is a number of digits!";
} else {
echo "This is not a number of digits!";
}
?>
Output to Example 3
Quote
This is not a number of digits!