String function substr() in php_PHP tutorial

String function substr() in php

Syntax: string substr(string $string int $start [,int $end]), this function also intercepts by bytes (not characters), pay attention when intercepting Chinese, and the starting position of intercepting must be at the end position The left side of , that is, always intercepted from left to right.

$str="Hello world!";

echo substr($str,3),"
";//The result is lo world!

echo substr($str,3,8),"
";//result lo wo

echo substr($str,-6),"
";//At this time, the second parameter is a negative number, which means intercepting from the sixth position from the bottom, and the result is world

echo substr($str,-6,-3),"
";//When the third parameter is a negative number, it represents the intercepted length, and the result is wor

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