mb_ 시리즈 함수와 일반 문자 함수의 차이점

mb 함수는 인코딩 형식에 따라 텍스트를 처리하는 함수 확장 입니다.

/etc/php.ini 구성 파일을 수정하고 확장명=php_mbstring.so를 추가하세요

제가 가장 많이 사용하는 substr 함수를 예로 들어보겠습니다. 한눈에 알 수 있습니다.

예:

<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> = '我是谁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"> 谁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/>';

10행과 12행을 보면 효과가 명확합니다.