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怎么在字符串前面加上www

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Release： 2016-06-23 13:56:55
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已知字符串$aa=efwef

怎么在字符串前面加上www 变成wwwefwef


回复讨论(解决方案)

字符串拼接  .

$aa='www'.'efwef';
echo $aa; 

<?php$aa = 'efwef';$aa = 'www'.$aa;echo $aa;?>
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