php null 0

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Understanding PHP NULL from storage structure, null,0 ' 0 ' false____ storage

I believe that many developers are familiar with the 0 "0" null false ' explanation on the network, but I believe there is always the details you ignore, or from the variable structure point of view, how to explain. Then look at the verification

PHP: empty, isset, is_null, array (0), array (), array (""), 0, "0", "", "null", NULL summary

PHP: empty, isset, is_null, array (0), array (), array (), 0, 0, null, NULL summary through the following program to detect $a=0;if(empty($a)){echo "yes|";}else{echo "no|";}if(isset($a)){echo "yes|";}else{echo "no|";}if(is_null($a)){echo "yes|";}

Php 0, null, empty, null, false, detailed introduction to the string relationship _ PHP Tutorial

Php 0, null, empty, null, false, detailed description of the string relationship. I encountered a strange problem in a project, and it took me a lot of time to solve it. The final debugging found that it was a judgment problem-about 0 and ''(null

PHP empty string describes the relationship between 0, null, empty, and false

: This article mainly introduces the relationship between 0, null, empty, and false in PHP empty strings. For more information about PHP tutorials, see. // Determine the relationship between 0 and '', null, empty, and false $ A = 0; Echo

In-depth understanding of the relationship between 0, null, empty, null, false, and strings in php

In-depth understanding of the relationship between 0, null, empty, null, false, and strings in php // Judge the relationship between 0 and ''and empty null false. start // If ('safdasefasefasf' = 0 ){

* Please refer to the following link for more information: {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0 }.®Zookeeper

* Please refer to the following link for more information: {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0}, {0 }. 1. µúram» ~» ~~~~~~~~~****************************************************** 2. zookeeper · zookeeper has been added to

PHP empty string describes the relationship between 0, null, empty, and false _ PHP Tutorial-php Tutorial

The PHP empty string describes the relationship between 0, null, empty, and false. If the method function is used incorrectly or is used less, if the logic sequence of several method functions is wrong, it may be a vulnerability and cannot be found

Php 0, null, empty, null, false, detailed description of the string relationship

I encountered a strange problem in a project, and it took me a lot of time to solve it. The final debugging found that it was a judgment problem-about 0 and ''(null single quotes, for better understanding, I added a space), I found that 0 = "was

PHP 0, null, empty, null, false, detailed description of the string relationship

I encountered a strange problem in a project, and it took me a lot of time to solve it. The final debugging found that it was a judgment problem-about 0 and ''(null single quotes, for better understanding, I added a space), I found that 0 = "was

PHP Hollow String describes the relationship between 0, null, empty, and false

Determine the relationship between 0 and ', null, empty, False $a = 0; The relationship between echo "0 and", empty, NULL, false: "; if ($a = = ") { echo "0 = ="; "; }else{ echo "0! ="; "; } if (trim ($a) = = ") { echo "Trim (0) = ="; "; }else{ echo

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