stripos
Find the position of the first occurrence of a case-insensitive substring in a string
[...] = optional ... = your value
[var $... = ]call stripos $haystack=…;$needle=…[;$offset=…]
negative $offset values do not work
Example code
Example output
Reloadhaystack = abefcdefghijklm
needle = EF
offset = 4
position = 6
