The is_double() function is an inbuilt function in PHP which is used to find whether the given value is a double or not.
Syntax:
bool is_double( $variable_name )
Parameters: This function accepts one parameter as mentioned above and described below:
- $variable_name: This parameter holds the value which need to check.
Return Value: It is a boolean value i.e. either TRUE if $variable_name contains is a double value, otherwise returns FALSE.
Below programs illustrate the is_double() function in PHP:
Program 1:
<?php // PHP code to implement is_double() // function   function square($num) {     return (is_double($num)); }   echo square(9.09) ."\n"; // outputs '1'. echo square(FALSE) ."\n"; // gives no output. echo square(14) ."\n"; // gives no output. echo square(56.30) ."\n"; // outputs '1'   ?> |
Output:
1 1
Program 2:
<?php // PHP code to implement is_double() // function   $variable_name1 = 67.099; $variable_name2 = 32; $variable_name3 = "abc"; $variable_name4 = FALSE;   // $variable_name1 is double value, gives TRUE if (is_double($variable_name1))     echo "$variable_name1 is a double value. \n"; else    echo "$variable_name1 is not a double value. \n";   // $variable_name2 is not a double value, gives FALSE if (is_double($variable_name2))     echo "$variable_name2 is a double value. \n"; else    echo "$variable_name2 is not a double value. \n";   // $variable_name3 is not a double value, gives FALSE if (is_double($variable_name3))     echo "$variable_name3 is a double value. \n"; else    echo "$variable_name3 is not a double value. \n";   // $variable_name4 is not a double value, gives FALSE if (is_double($variable_name4))     echo "FALSE is a double value. \n"; else    echo "FALSE is not a double value. \n"; ?> |
Output:
67.099 is a double value. 32 is not a double value. abc is not a double value. FALSE is not a double value.
Reference: https://www.php.net/manual/en/function.is-double.php
