PHP is_int(), is_integer(), is_long() Functions
PHP Available Functionsis_int()The function is used to check whether a variable is an integer.
Note:If you want to test whether a variable is a number or a numeric string (such as form input, which is usually a string), you must useis_numeric()。
Alias function()：is_integer()、is_long() 。
PHP Version Requirements: PHP 4, PHP 5, PHP 7
Syntax
bool is_int ( mixed $var )
Parameter Description:
- $var: The variable to be checked.
Return Value
Returns TRUE if the specified variable is an integer, otherwise returns FALSE.
Example
Example
$var_name1=678;
$var_name2="a678";
$var_name3="678";
$var_name4=999;
$var_name5=698.99;
$var_name6=array("a1","a2");
$var_name7=+125689.66;
if (is_int($var_name1))
{
echo "$var_name1is an integer" . PHP_EOL ;
}
else
{
echo "$var_name1is not an integer" . PHP_EOL ;
}
if (is_int($var_name2))
{
echo "$var_name2is an integer" . PHP_EOL ;
}
else
{
echo "$var_name2is not an integer" . PHP_EOL ;
}
$result=is_int($var_name3);
echo "[ $var_name3Is it an integer? ]" .var_dump($result) . PHP_EOL;
$result=is_int($var_name4);
echo "[ $var_name4Is it an integer? ]" .var_dump($result) . PHP_EOL;
$result=is_int($var_name5);
echo "[ $var_name5Is it an integer? ]" .var_dump($result) . PHP_EOL;
$result=is_int($var_name6);
echo "[ $var_name6Is it an integer? ]" .var_dump($result) . PHP_EOL;
$result=is_int($var_name7);
echo "[ $var_name7Is it an integer? ]" .var_dump($result);
The output result is:
678 是整数 a678 不是整数 bool(false) [ 678 是整数吗? ] bool(true) [ 999 是整数吗? ] bool(false) [ 698.99 是整数吗? ] bool(false) [ Array 是整数吗? ] bool(false) [ 125689.66 是整数吗? ]Other Extensions