STRCHR vs STRRCHR difference? [closed]

Answer 1

strchr finds the first occurrence and strrchr (r - reverse) finds the last occurrence of a character or string

$s = 'This is a test';
$first = strchr($s, 's');
$last = strrchr($s, 's');

• $first contains s is a test
• $last contains st

Answer 2

strchr is an alias of strstr:

Returns part of haystack string starting from and including the first occurrence of needle to the end of haystack.

strrchr:

This function returns the portion of haystack which starts at the last occurrence of needle and goes until the end of haystack.

strchr starts at the first occurrence, strrchr starts at the last occurrence.