Undefined Index: 0
2005
"Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP
118912
Fatal error: Unsupported operand types
69607
Do you use NULL or 0 (zero) for pointers in C++?
108661
In php, is 0 treated as empty?
121181
Are undefined terms allowed in a sequence?
19574
undefined offset PHP error
152538
What is causing undefined control sequence?
71111
Fatal error: Call to undefined method mysqli_stmt::fetch_array()
130312
Why aren't hash values for "nothing" (empty) defined as all zeros?
125415
Why is undefined == undefined but NaN != NaN?
148300
Why $0 is not a positional parameter?
116133
Why do I get an "undefined reference" link error for a static member variable?
19434
Why does mysqli num_rows always return 0?
155663
Undefined control sequence \printbibliography
88588
php $_GET and undefined index
14660
Undefined variable as function argument javascript
91338
! Undefined control sequence