isset

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In php using @ instead of isset

In some conditions, may I use an @ character instead of using the longer isset() function? If not, why not?[详细]

2023-03-23 12:22 分类：问答
IF ISSET not working?

IN DB row1 (type column=apple), (stage column=1) row2 (type column=orange), (stage column=NULL) IN PHP 开发者_Python百科[详细]

2023-03-19 20:12 分类：问答
Variable Undefined in PHP

I have 5 fields in my DB: test1 = 1, test2 = 1, test3 = NULL, test4 = NULL, test5 = NULL PHP code: if(isset($result[\'test1\'])){$test1= \"Test1\"; echo $test1};[详细]

2023-03-16 21:14 分类：问答
If isset for constants, but not defined?

If I set a constant to = \'\', How to I check if constant has something inside ? (ie see if it is set to something other than the empty string.)[详细]

2023-03-15 05:17 分类：问答
Why is array_key_exists 1000x slower than isset on referenced arrays?

I have found that array_key_exists is over 1000x slower than isset at check if a key is set in an array reference. Does anyone that has an understanding of how PHP is implemented explain why this is t[详细]

2023-03-12 10:52 分类：问答
How to implement __isset() magic method in PHP?

I\'m trying to make functions like empty() and isset() work with data returned by methods. What I have so far:[详细]

2023-03-10 06:26 分类：问答
Using Isset with native sessions in CodeIgniter

I\'ve read about how CI handles sessions differently than native sessions and feel slightly insecure about storing all the data in a cookie(?), unlike PHP\'s native session which only stores the sessi[详细]

2023-03-10 05:07 分类：问答
php how to attach a if statement to a button?

I have a I statement; if($game_set->issue_challenge()){echo \"test\";}else {\"test failed\";} and I have a button:[详细]

2023-03-03 20:33 分类：问答
Code to forward browser if user is not logged in (checking if session variable isset) is not firing

I am trying to set all of my pages to forward to the login screen if the user is not logged in using session data, however it is not working. When a user clicks the links it just continues to the new[详细]

2023-03-01 16:29 分类：问答
What is the difference between null and empty?

I am new to the concept of empty and null. Whilst I have endeavoured to understand the difference between them, I am more confused. I came across an article at http://www.tutorialarena.com/blog/php-is[详细]

2023-02-24 04:59 分类：问答