PHP is_string() Function

PHP 可用的函数PHP Available Functions

is_string()This function is used to detect whether a variable is a string.

PHP Version Requirements: PHP 4, PHP 5, PHP 7

Syntax

bool is_string ( mixed $var )

Parameter Description:

  • $var: The variable to be tested.

Return Value

Returns TRUE if the specified variable is a string, otherwise returns FALSE.

Example

Example

<?php if (is_string("2663")) echo 'This is a string.' . PHP_EOL; else echo 'This is not a string.'; var_dump(is_string('XYZ')); var_dump(is_string("99")); var_dump(is_string(123.05)); var_dump(is_string(false)); ?>

The output result is:

这是一个字符串。
bool(true)
bool(true)
bool(false)
bool(false)

PHP 可用的函数PHP Available Functions

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