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String comparison using == operator in PHP_PHP Tutorial

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Jul 21, 2016 pm 03:59 PM

php superior publish string most Compare use of operator conduct

A new article comparing strings in PHP with the == operator recently published on Greg Beaver's blog mentioned issues worth noting when comparing strings with PHP's == operator.

In some cases, PHP will convert numerical data (such as strings containing numbers, etc.) into numerical processing, and the == operator is one of them. When using the == operator to loosely compare two strings, PHP will convert -like numerical strings into numerical values ??for comparison. The following experiment confirms this conclusion:
<code> <?php var_dump('01' == 1); ?> var_dump('01' == 1);
?>

The output result of the above code is:
bool(true) Therefore, when using When comparing strings, it is recommended to use the === operator to strictly check the strings, or use functions such as strcmp() to avoid possible problems. The "PHP Type Comparison Table" in the PHP manual also explains this in detail.

<?php var_dump(in_array('01', array('1'))); ?> In addition, the commonly used in_array() function also has weak type problems, see the following code:

<?php var_dump(in_array('01' , array('1'))); ?>Above The code output result is: bool(true)

I believe that PHP programmers who have used this function for security checks know what kind of security problems this will cause, right? Fortunately, the <?php var_dump(in_array('01', array('1'), true)); ?> in_array() function provides us with a third parameter. Setting it to true can turn on the mandatory type checking mechanism of the
in_array() function, as shown in the following code:

&lt ;?php var_dump(in_array('01', array('1'), true)); ?>

truehttp: //www.bkjia.com/PHPjc/317213.htmlTechArticle mentioned in a new article recently published on Greg Beaver's blog comparing strings in PHP with the == operator As for the issues worth noting when comparing strings with PHP's == operator...

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