Question

Python has the great: if sub-string in string, like this:

if "fox" in "The quick brown fox jumps over the lazy dog":
   print True

Does does PHP have something equivalent to this?

Answer 1

Yes, see stripos and strpos

if(stripos("The quick brown fox jumps over the lazy dog","fox")!==false)
   { echo 'True'; }

stripos and strpos return the position at which the match started, so you need to use strict comparison (=== or !==) to avoid a false negative when the needle is at pos. 0 in the haystack.

You may prefer stristr, which just returns the matched string or boolean false.

in_array works about the same as in does in Python for lists and dictionaries, if you are also thinking beyond strings.