Home >php教程 >php手册 >常用字符串处理代码片段

常用字符串处理代码片段

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-06-21 08:53:01927browse

  移除 HTML 标签

<ol class="dp-c"><li class="alt"><span><span class="vars">$text</span><span> = </span><span class="func">strip_tags</span><span>(</span><span class="vars">$input</span><span>, </span><span class="string">""</span><span>); </span></span></li></ol>

  返回 $start 和 $end 之间的文本

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> GetBetween(</span><span class="vars">$content</span><span>,</span><span class="vars">$start</span><span>,</span><span class="vars">$end</span><span>){ </span></span></li>
<li><span>    <span class="vars">$r</span><span> = </span><span class="func">explode</span><span>(</span><span class="vars">$start</span><span>, </span><span class="vars">$content</span><span>); </span></span></li>
<li class="alt"><span>    <span class="keyword">if</span><span> (isset(</span><span class="vars">$r</span><span>[1])){ </span></span></li>
<li><span>        <span class="vars">$r</span><span> = </span><span class="func">explode</span><span>(</span><span class="vars">$end</span><span>, </span><span class="vars">$r</span><span>[1]); </span></span></li>
<li class="alt"><span>        <span class="keyword">return</span><span> </span><span class="vars">$r</span><span>[0]; </span></span></li>
<li><span>    } </span></li>
<li class="alt"><span>    <span class="keyword">return</span><span> </span><span class="string">''</span><span>; </span></span></li>
<li><span>} </span></li>
</ol>

  将url转换成链接

<ol class="dp-c">
<li class="alt"><span><span class="vars">$url</span><span> = </span><span class="string">"Jean-Baptiste Jung (http://www.webdevcat.com)"</span><span>; </span></span></li>
<li><span><span class="vars">$url</span><span> = preg_replace(</span><span class="string">"#http://([A-z0-9./-]+)#"</span><span>, </span><span class="string">'<a>$0</a>'</span><span>, </span><span class="vars">$url</span><span>); </span></span></li>
</ol>

  切分字符串为140个字符

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> split_to_chunks(</span><span class="vars">$to</span><span>,</span><span class="vars">$text</span><span>){ </span></span></li>
<li><span>    <span class="vars">$total_length</span><span> = (140 - </span><span class="func">strlen</span><span>(</span><span class="vars">$to</span><span>)); </span></span></li>
<li class="alt"><span>    <span class="vars">$text_arr</span><span> = </span><span class="func">explode</span><span>(</span><span class="string">" "</span><span>,</span><span class="vars">$text</span><span>); </span></span></li>
<li><span>    <span class="vars">$i</span><span>=0; </span></span></li>
<li class="alt"><span>    <span class="vars">$message</span><span>[0]=</span><span class="string">""</span><span>; </span></span></li>
<li><span>    <span class="keyword">foreach</span><span> (</span><span class="vars">$text_arr</span><span> </span><span class="keyword">as</span><span> </span><span class="vars">$word</span><span>){ </span></span></li>
<li class="alt"><span>        <span class="keyword">if</span><span> ( </span><span class="func">strlen</span><span>(</span><span class="vars">$message</span><span>[</span><span class="vars">$i</span><span>] . </span><span class="vars">$word</span><span> . </span><span class="string">' '</span><span>) <span class="vars">$total_length</span><span> ){ </span></span></span></li>
<li><span>            <span class="keyword">if</span><span> (</span><span class="vars">$text_arr</span><span>[</span><span class="func">count</span><span>(</span><span class="vars">$text_arr</span><span>)-1] == </span><span class="vars">$word</span><span>){ </span></span></li>
<li class="alt"><span>                <span class="vars">$message</span><span>[</span><span class="vars">$i</span><span>] .= </span><span class="vars">$word</span><span>; </span></span></li>
<li><span>            } <span class="keyword">else</span><span> { </span></span></li>
<li class="alt"><span>                <span class="vars">$message</span><span>[</span><span class="vars">$i</span><span>] .= </span><span class="vars">$word</span><span> . </span><span class="string">' '</span><span>; </span></span></li>
<li><span>            } </span></li>
<li class="alt"><span>        } <span class="keyword">else</span><span> { </span></span></li>
<li><span>            <span class="vars">$i</span><span>++; </span></span></li>
<li class="alt"><span>            <span class="keyword">if</span><span> (</span><span class="vars">$text_arr</span><span>[</span><span class="func">count</span><span>(</span><span class="vars">$text_arr</span><span>)-1] == </span><span class="vars">$word</span><span>){ </span></span></li>
<li><span>                <span class="vars">$message</span><span>[</span><span class="vars">$i</span><span>] = </span><span class="vars">$word</span><span>; </span></span></li>
<li class="alt"><span>            } <span class="keyword">else</span><span> { </span></span></li>
<li><span>                <span class="vars">$message</span><span>[</span><span class="vars">$i</span><span>] = </span><span class="vars">$word</span><span> . </span><span class="string">' '</span><span>; </span></span></li>
<li class="alt"><span>            } </span></li>
<li><span>        } </span></li>
<li class="alt"><span>    } </span></li>
<li><span>    <span class="keyword">return</span><span> </span><span class="vars">$message</span><span>; </span></span></li>
<li class="alt"><span>} </span></li>
</ol>

  删除字符串中的URL

<ol class="dp-c"><li class="alt"><span><span class="vars">$string</span><span> = preg_replace(</span><span class="string">'/\b(https?ftpfile):\/\/[-A-Z0-9+&@#\/%?=~_$!:,.;]*[A-Z0-9+&@#\/%=~_$]/i'</span><span>, </span><span class="string">''</span><span>, </span><span class="vars">$string</span><span>); </span></span></li></ol>

  将字符串转成SEO友好的字符串

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> slug(</span><span class="vars">$str</span><span>){ </span></span></li>
<li><span>    <span class="vars">$str</span><span> = </span><span class="func">strtolower</span><span>(trim(</span><span class="vars">$str</span><span>)); </span></span></li>
<li class="alt"><span>    <span class="vars">$str</span><span> = preg_replace(</span><span class="string">'/[^a-z0-9-]/'</span><span>, </span><span class="string">'-'</span><span>, </span><span class="vars">$str</span><span>); </span></span></li>
<li><span>    <span class="vars">$str</span><span> = preg_replace(</span><span class="string">'/-+/'</span><span>, </span><span class="string">"-"</span><span>, </span><span class="vars">$str</span><span>); </span></span></li>
<li class="alt"><span>    <span class="keyword">return</span><span> </span><span class="vars">$str</span><span>; </span></span></li>
<li><span>} </span></li>
</ol>

  解析 CSV 文件

<ol class="dp-c">
<li class="alt"><span><span class="vars">$fh</span><span> = </span><span class="func">fopen</span><span>(</span><span class="string">"contacts.csv"</span><span>, </span><span class="string">"r"</span><span>); </span></span></li>
<li><span><span class="keyword">while</span><span>(</span><span class="vars">$line</span><span> = </span><span class="func">fgetcsv</span><span>(</span><span class="vars">$fh</span><span>, 1000, </span><span class="string">","</span><span>)) { </span></span></li>
<li class="alt"><span>    <span class="func">echo</span><span> </span><span class="string">"Contact: {$line[1]}"</span><span>; </span></span></li>
<li><span>} </span></li>
</ol>

  字符串搜索

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> contains(</span><span class="vars">$str</span><span>, </span><span class="vars">$content</span><span>, </span><span class="vars">$ignorecase</span><span>=true){ </span></span></li>
<li><span>    <span class="keyword">if</span><span> (</span><span class="vars">$ignorecase</span><span>){ </span></span></li>
<li class="alt"><span>        <span class="vars">$str</span><span> = </span><span class="func">strtolower</span><span>(</span><span class="vars">$str</span><span>); </span></span></li>
<li><span>        <span class="vars">$content</span><span> = </span><span class="func">strtolower</span><span>(</span><span class="vars">$content</span><span>); </span></span></li>
<li class="alt"><span>    } </span></li>
<li><span>    <span class="keyword">return</span><span> </span><span class="func">strpos</span><span>(</span><span class="vars">$content</span><span>,</span><span class="vars">$str</span><span>) ? true : false; </span></span></li>
<li class="alt"><span>} </span></li>
</ol>

  检查字符串是否以某个串开始

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> String_Begins_With(</span><span class="vars">$needle</span><span>, </span><span class="vars">$haystack</span><span> { </span></span></li>
<li><span>    <span class="keyword">return</span><span> (</span><span class="func">substr</span><span>(</span><span class="vars">$haystack</span><span>, 0, </span><span class="func">strlen</span><span>(</span><span class="vars">$needle</span><span>))==</span><span class="vars">$needle</span><span>); </span></span></li>
<li class="alt"><span>} </span></li>
</ol>

  从字符串中提取email地址

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> extract_emails(</span><span class="vars">$str</span><span>){ </span></span></li>
<li><span>    <span class="comment">// This regular expression extracts all emails from a string:</span><span> </span></span></li>
<li class="alt"><span>    <span class="vars">$regexp</span><span> = </span><span class="string">'/([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+/i'</span><span>; </span></span></li>
<li><span>    preg_match_all(<span class="vars">$regexp</span><span>, </span><span class="vars">$str</span><span>, </span><span class="vars">$m</span><span>); </span></span></li>
<li class="alt"><span> </span></li>
<li><span>    <span class="keyword">return</span><span> isset(</span><span class="vars">$m</span><span>[0]) ? </span><span class="vars">$m</span><span>[0] : </span><span class="keyword">array</span><span>(); </span></span></li>
<li class="alt"><span>} </span></li>
<li><span> </span></li>
<li class="alt"><span><span class="vars">$test_string</span><span> = 'This is a test string... </span></span></li>
<li><span> </span></li>
<li class="alt"><span>        test1@example.org </span></li>
<li><span> </span></li>
<li class="alt"><span>        Test different formats: </span></li>
<li><span>        test2@example.org; </span></li>
<li class="alt">
<span>        <a class="string">"test3@example.org"</a></span><span>>foobar </span>
</li>
<li><span>        <test4> </test4></span></li>
<li class="alt"><span> </span></li>
<li><span>        strange formats: </span></li>
<li class="alt"><span>        test5@example.org </span></li>
<li><span>        test6[at]example.org </span></li>
<li class="alt"><span>        test7@example.net.org.com </span></li>
<li><span>        test8@ example.org </span></li>
<li class="alt"><span>        test9@!foo!.org </span></li>
<li><span> </span></li>
<li class="alt"><span>        foobar </span></li>
<li><span>'; </span></li>
<li class="alt"><span> </span></li>
<li><span>print_r(extract_emails(<span class="vars">$test_string</span><span>)); </span></span></li>
</ol>

  [PHP]代码

<ol class="dp-c">
<li class="alt"><span><span class="keyword">function</span><span> extract_emails(</span><span class="vars">$str</span><span>){ </span></span></li>
<li><span>    <span class="comment">// This regular expression extracts all emails from a string:</span><span> </span></span></li>
<li class="alt"><span>    <span class="vars">$regexp</span><span> = </span><span class="string">'/([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+/i'</span><span>; </span></span></li>
<li><span>    preg_match_all(<span class="vars">$regexp</span><span>, </span><span class="vars">$str</span><span>, </span><span class="vars">$m</span><span>); </span></span></li>
<li class="alt"><span> </span></li>
<li><span>    <span class="keyword">return</span><span> isset(</span><span class="vars">$m</span><span>[0]) ? </span><span class="vars">$m</span><span>[0] : </span><span class="keyword">array</span><span>(); </span></span></li>
<li class="alt"><span>} </span></li>
<li><span> </span></li>
<li class="alt"><span><span class="vars">$test_string</span><span> = 'This is a test string... </span></span></li>
<li><span> </span></li>
<li class="alt"><span>        test1@example.org </span></li>
<li><span> </span></li>
<li class="alt"><span>        Test different formats: </span></li>
<li><span>        test2@example.org; </span></li>
<li class="alt">
<span>        <a class="string">"test3@example.org"</a></span><span>>foobar </span>
</li>
<li><span>        <test4> </test4></span></li>
<li class="alt"><span> </span></li>
<li><span>        strange formats: </span></li>
<li class="alt"><span>        test5@example.org </span></li>
<li><span>        test6[at]example.org </span></li>
<li class="alt"><span>        test7@example.net.org.com </span></li>
<li><span>        test8@ example.org </span></li>
<li class="alt"><span>        test9@!foo!.org </span></li>
<li><span> </span></li>
<li class="alt"><span>        foobar </span></li>
<li><span>'; </span></li>
<li class="alt"><span> </span></li>
<li><span>print_r(extract_emails(<span class="vars">$test_string</span><span>)); </span></span></li>
</ol>



Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn