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PHP Detailed Explanation of Program Code to Determine Variable Type_PHP Tutorial

WBOYOriginal: 2016-07-13 17:15:13760browse

The method to check the variable type in PHP is very simple. Use the gettype() function to return the current variable type. Now I will introduce to you in detail how to use the gettype function to check the variable type. Friends who need to know more can refer to.

string gettype ( mixed $var ) returns the type of PHP variable var.

Example

The code is as follows

代码如下	复制代码
function get_type($var) { if(is_object($var)) return get_class($var); if(is_null($var)) return 'null'; if(is_string($var)) return 'string'; if(is_array($var)) return 'array'; if(is_int($var)) return 'integer'; if(is_bool($var)) return 'boolean'; if(is_float($var)) return 'float'; if(is_resource($var)) return 'resource'; //throw new NotImplementedException(); return 'unknown'; } ?>

Copy code

function get_type($var)

{

If(is_object($var))

代码如下

复制代码

/**
* Returns the type of the var passed.
*
* @param mixed $var Variable
* @return string Type of variable
*/
function myGetType($var)
{
if (is_array($var)) return "array";
if (is_bool($var)) return "boolean";
if (is_float($var)) return "float";
if (is_int($var)) return "integer";
if (is_null($var)) return "NULL";
if (is_numeric($var)) return "numeric";
if (is_object($var)) return "object";
if (is_resource($var)) return "resource";
if (is_string($var)) return "string";
return "unknown type";
}
?>

return get_class($var);

If(is_null($var))
return 'null'; If(is_string($var)) return 'string';

If(is_array($var))

return 'array';

If(is_int($var))

return 'integer';

If(is_bool($var))

return 'boolean';

If(is_float($var))

return 'float';

If(is_resource($var))

return 'resource';

//throw new NotImplementedException();

Return 'unknown';

}

Officially said: Do not use gettype() to test a certain type, because the string it returns may need to change in future versions. Additionally, due to the inclusion of Without string comparison, its operation is also slower. Use is_* functions instead.

The code is as follows

Copy code

/**<🎜> * Returns the type of the var passed.<🎜> *<🎜> * @param mixed $var Variable<🎜> * @return string Type of variable<🎜> */<🎜> Function myGetType($var)<🎜> {<🎜> If (is_array($var)) return "array";<🎜> If (is_bool($var)) return "boolean";<🎜> If (is_float($var)) return "float";<🎜> If (is_int($var)) return "integer";<🎜> If (is_null($var)) return "NULL";<🎜> If (is_numeric($var)) return "numeric";<🎜> If (is_object($var)) return "object";<🎜> If (is_resource($var)) return "resource";<🎜> If (is_string($var)) return "string";<🎜> return "unknown type";<🎜> }<🎜> ?> Some other variable type judgment collections array_key_exists(mixed key, array search) ://Check whether the given key name or index exists in the array Determine the data type is_numeric (mixed var): //Check whether the measured variable is a number or a digital string is_bool($ var): //Check whether the measured variable is of Boolean type is_float($ var): //Check whether the measured variable is of floating point type. It has the same usage as is_double and is_real() is_int($ var): //Check whether the measured variable is an integer. The same usage as is_integer() is_string($ var): //Check whether the measured variable is a string is_object($ var): //Check whether the measured variable is an object is_array($ var): //Check whether the measured variable is an array is_null($ var): //Check whether the measured variable is null

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