Undefined index: string in (...)
7250
Reference - What does this error mean in PHP?
68074
JavaScript 'in' operator for `undefined` elements in Arrays
53203
Checking for undefined
2005
"Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP
137080
PHP: Illegal string-offset
16981
Warning: mysqli_query() expects parameter 1 to be mysqli, string given in
152538
What is causing undefined control sequence?
99703
Cout of a string is giving an error and a hard time some insight help pls?
619
Why are these constructs using pre and post-increment undefined behavior?
1262
Fatal error: [] operator not supported for strings
67525
malloc undefined
139424
How to put variable inside string-resources?
154947
Find index of a value in an array
4650
Why does substring slicing with index out of range work?
21904
define variable index
127606
How to use index in the file name
1238
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource