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php如何去掉字符串最后一个字符

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Release： 2016-06-23 13:49:38
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php如何去掉字符串最后一个字符，$a = 1,2,3,4,      ，注意，是去掉4后面的逗号，而不是去掉4


回复讨论(解决方案)

trim($string, ',');

echo substr($a, 0, -1); 

$a='1,2,3,4,';$b=rtrim($a,',');echo $b;
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