strstr and substr

Difference between strstr and substr
No. strstr substr
1 It will return substring from the first matching occurrence to the end of string. It will return part of the string from the given index to its length parameters.
2 e.g.
$str = ‘';
echo strstr($str,’c’);
output ::  
$rest = substr("abcdef", -1);    // returns "f"
$rest = substr("abcdef", -2);    // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"

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