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mb_系列函數(shù)和普通字符函數(shù)的區(qū)別

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Dec 05, 2016 pm 01:26 PM

mb函數(shù)是根據(jù)編碼格式處理文字的函數(shù)擴展。

修改/etc/php.ini配置文件，增加extension=php_mbstring.so

?用我最常用的substr函數(shù)舉例子。一目了然。

舉例：

<span style="color: #008080"> 1</span> <span style="color: #000000">php
</span><span style="color: #008080"> 2</span>         <span style="color: #008000">//</span><span style="color: #008000">phpinfo();</span>
<span style="color: #008080"> 3</span>         <span style="color: #800080">$str</span> = 'abcdef'<span style="color: #000000">;
</span><span style="color: #008080"> 4</span>         <span style="color: #0000ff">echo</span> <span style="color: #008080">strlen</span>(<span style="color: #800080">$str</span>);<span style="color: #008000">//</span><span style="color: #008000"> 6</span>
<span style="color: #008080"> 5</span>         <span style="color: #0000ff">echo</span> '<br>'<span style="color: #000000">;
</span><span style="color: #008080"> 6</span>         <span style="color: #0000ff">echo</span> <span style="color: #008080">substr</span>(<span style="color: #800080">$str</span>, 1,2);<span style="color: #008000">//</span><span style="color: #008000"> bc</span>
<span style="color: #008080"> 7</span>         <span style="color: #0000ff">echo</span> '<br>'<span style="color: #000000">;
</span><span style="color: #008080"> 8</span> 
<span style="color: #008080"> 9</span>         <span style="color: #800080">$str2</span> = '我是誰ab'<span style="color: #000000">;
</span><span style="color: #008080">10</span>         <span style="color: #0000ff">echo</span> <span style="color: #008080">substr</span>(<span style="color: #800080">$str2</span>, 2, 2);<span style="color: #008000">//</span><span style="color: #008000"> ??</span>
<span style="color: #008080">11</span>         <span style="color: #0000ff">echo</span> '<br>'<span style="color: #000000">;
</span><span style="color: #008080">12</span>         <span style="color: #0000ff">echo</span> mb_substr(<span style="color: #800080">$str2</span>, 2, 2, 'UTF-8');<span style="color: #008000">//</span><span style="color: #008000"> 誰a</span>
<span style="color: #008080">13</span>         <span style="color: #0000ff">echo</span> '<br>'<span style="color: #000000">;
</span><span style="color: #008080">14</span>         <span style="color: #0000ff">echo</span> <span style="color: #008080">strlen</span>(<span style="color: #800080">$str2</span>);<span style="color: #008000">//</span><span style="color: #008000"> 11</span>
<span style="color: #008080">15</span>         <span style="color: #0000ff">echo</span> '<br>'<span style="color: #000000">;
</span><span style="color: #008080">16</span>         <span style="color: #0000ff">echo</span> mb_strlen(<span style="color: #800080">$str2</span>, 'UTF-8');<span style="color: #008000">//</span><span style="color: #008000"> 5</span>
<span style="color: #008080">17</span>         <span style="color: #0000ff">echo</span> '<br>';

看第10和12行，作用就很清楚了。

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