How to determine whether it is a string in php

How to determine whether it is a string in PHP: You can use PHP's built-in function is_string() to determine. The is_string() function is used to detect whether a variable is a string. If the specified variable is a string, it returns true, otherwise it returns false.

php provides us with the is_string() function, which is used to detect whether a variable is a string.

If the specified variable is a string, return TRUE, otherwise return FALSE.

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Grammar:

bool is_string ( mixed $var )

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Implementation code:

<?php
if (is_string("2663"))
    echo &#39;这是一个字符串。&#39; . PHP_EOL; else
    echo &#39;这不是一个字符串。&#39;;
var_dump(is_string(&#39;XMYZ&#39;));
var_dump(is_string("999"));
var_dump(is_string(1293.05));
var_dump(is_string(false));
?>

Run result:

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

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