String function substr () in PHP
Syntax: String substr (string $string int $start [, int $end]), which is also truncated in bytes (not characters), when intercepting Chinese, it is important to note that the starting position of the intercept must be at the left of the end position, that is, always from left to right intercept. ";//Results lo world!echo substr ($str, 3,8),"
";//Results lo woecho substr ($str,-6),"
The second parameter is a negative number to intercept from the sixth position, and the result is Worldecho substr ($str, -6,-3), "
";//when the third parameter is negative, the length of the intercept is indicated, and the result is WOR
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