PHP - is_integer() 函式

定義和用法

函式 is_integer() 檢查變數的型別是否為整數。此函式是 is_int() 的別名。

語法

bool is_integer ( mixed $value )

引數

返回值

如果 value 是 int，則此函式返回 true，否則返回 false。

依賴項

PHP 4 及更高版本

示例

以下示例演示了使用不同型別變數的返回值 -

<?php
   $a = 33;
   echo "a is "; var_dump(is_integer($a)); echo "<br>";

   $b = "33";
   echo "b is "; var_dump(is_integer($b)); echo "<br>";

   $c = 33.5;
   echo "c is "; var_dump(is_integer($c)); echo "<br>";

   $d = "33.5";
   echo "d is "; var_dump(is_integer($d)); echo "<br>";

   $e = true;
   echo "e is "; var_dump(is_integer($e)); echo "<br>";

   $f = false;
   echo "f is "; var_dump(is_integer($f)); echo "<br>";

   $g = null;
   echo "g is "; var_dump(is_integer($g)); echo "<br>";
?>

輸出

這將產生以下結果 -

a is bool(true)
b is bool(false)
c is bool(false)
d is bool(false)
e is bool(false)
f is bool(false)
g is bool(false)