Avoiding "NOTICE: undefined index/variable" - Different ways of checking arrays/variables for value in php
2005
"Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP
60800
PHP: Access Array Value on the Fly
114154
Displaying and Randomising php Arrays
576
How can I check for an empty/undefined/null string in JavaScript?
48242
How can I get useful error messages in PHP?
83782
How to check a not-defined variable in JavaScript
27136
Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?
96587
Is there a way to find out how "deep" a PHP array is?
14293
Best way to find if an item is in a JavaScript array?
27606
Detecting an undefined object property
100563
PHP: Right way to declare variable before use in loop
42004
What is the PHP shorthand for: print var if var exist
25703
Best way to test for a variable's existence in PHP; isset() is clearly broken
97134
PHP conditionals, brackets needed?
14704
How to detect if a variable is an array
10867
How to avoid ArrayIndexOutOfBoundsException or IndexOutOfBoundsException?
7951
PHP IF OR Else statement - best way to do this