PHP | is_int（）-yiteyi-C++库

is_int（）是PHP中的内置函数。is_int（）函数用于测试指定变量的类型是否为整数。

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语法 :

boolean is_int($variable_name)
Parameter: this function contains a single parameter 
$variable_name: the variable we want to check.
Return value : it is a boolean function so returns T
RUE when $variable_name is an integer, otherwise FALSE.

                     <?php                   
                     $variable_name1                               = 56;                   
                     $variable_name2                               =                               "xyz"                               ;                   
                             
                     if                               (                               is_int                               (                               $variable_name1                               ))                   
                     {                   
                                         echo                               "$variable_name1 is Integer "                               ;                   
                     }                   
                     else                   
                     {                   
                                         echo                               "$variable_name1 is not an Integer "                               ;                   
                     }                   
                     if                               (                               is_int                               (                               $variable_name2                               ))                   
                     {                   
                                         echo                               "$variable_name2 is Integer "                               ;                   
                     }                   
                     else                   
                     {                   
                                         echo                               "$variable_name2 is not Integer "                               ;                   
                     }                   
                     ?>                   

输出 :

56 is Integer 
xyz is not Integer

参考文献 : http://php.net/manual/en/function.is-int.php

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