how to shorten a string by certain number of characters?

Is there a php function that can chop let's say 10 chars of the end开发者_Go百科 of a string without calling strlen ? So I can avoid unnecessary repeating of variable names.

all I know is substr($str,0,strlen($str)-10);

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Read the manual: http://php.net/manual/en/function.substr.php.

...

If length is given and is negative, then that many characters will be omitted from the end of string.

...

$rest = substr("abcdef", 0, -1);  // returns "abcde"

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The documentation for substr clearly states:

string substr ( string $string , int $start [, int $length ] )

If length is given and is negative, then that many characters will be omitted from the end of string (after the start position has been calculated when a start is negative). If start denotes the position of this truncation or beyond, false will be returned.

So:

$str = substr($str, 0, -10);

Please, always use the documentation as your first port of call for reference questions. There is no reason at all not to use it.

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It's simple: You should also check to subtract length of the $str if the length is less that your required chars to remove.

substr($str,0,-10);

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If you give it a negative length, it'll remove that many characters from the end.

substr($str, 0, -10);

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http://sandbox.phpcode.eu/g/4fb74.php

-10 without strlen :)

<?php 
$str = "01234567890123456789"; 
echo substr($str,0,-10);

outputs 0123456789