Determine if a PHP array uses keys or indices
89978
How to check if PHP array is associative or sequential?
134748
Determine whether an array contains a value
63372
see if a variable equals any other variables in a list php
38810
PHP: array_map on object?
14661
How can I check if a Perl array contains a particular value?
137138
How to check if an array element exists?
68829
Is it necessary to declare PHP array before adding values with []?
110930
Finding the subsets of an array in PHP
26815
In PHP, how do you change the key of an array element?
17040
Check if an array is empty or exists
154477
Find value of sibling key in php array
187
How do I check if an array includes a value in JavaScript?
38430
In PHP, what does the ${$ } syntax do?
31416
How to cast array elements to strings in PHP?
118261
PHP: Sort an array by the length of its values?
124040
Testing if a hash has any of a number of keys
29593
What is the "->" PHP operator called?