PHP: what method to use when trimming a string to certain amount of chars?

if (strlen($filename) > 70) { //trim the string to 70 chars //delete chars from the beginning! }

what method do i use.

rega开发者_运维知识库rds matt

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$filename = substr($filename, -70);

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to get the last chars from a string:

substr($string, -70);

first 70 chars:

substr($string, 0, 70);

but, of course, you could check php docs for more info.