这个数字如何输出不了

WBOY
Release: 2016-06-13 13:46:14
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这个数字怎么输出不了?

PHP code
<!--

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-->$str = '12345678901234567890123456789012345678901234567890';

$num = $str + 1;

echo $num;
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输出的是科学计数法,我想得到12345678901234567890123456789012345678901234567891

------解决方案--------------------
PHP code
$str = '12345678901234567890123456789012345678901234567890'; 
echo bcadd($str,'1'); <div class="clear">
                 
              
              
        
            </div>
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