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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Conversion Filters</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="filters.html">List of Available Filters</a></div> <div class="next" style="text-align: right; float: right;"><a href="filters.compression.html">Compression Filters</a></div> <div class="up"><a href="filters.html">List of Available Filters</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="filters.convert" class="section"> <h2 class="title">Conversion Filters</h2> <p class="simpara"> Like the string.* filters, the convert.* filters perform actions similar to their names. The convert filters were added with PHP 5.0.0. For more information on a given filter, refer to the manual page for the corresponding function. </p> <p class="simpara"> <i>convert.base64-encode</i> and <i>convert.base64-decode</i> Use of these filters are equivalent to processing all stream data through the <a href="function.base64-encode.html" class="function">base64_encode()</a> and <a href="function.base64-decode.html" class="function">base64_decode()</a> functions respectively. <i>convert.base64-encode</i> supports parameters given as an associative array. If <i><tt class="parameter">line-length</tt></i> is given, the base64 output will be split into chunks of <i><tt class="parameter">line-length</tt></i> characters each. If <i><tt class="parameter">line-break-chars</tt></i> is given, each chunk will be delimited by the characters given. These parameters give the same effect as using <a href="function.base64-encode.html" class="function">base64_encode()</a> with <a href="function.chunk-split.html" class="function">chunk_split()</a>. </p> <div class="example"> <p><b>Example #1 convert.base64-encode & convert.base64-decode </b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'php://output'</span><span style="color: #007700">, </span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">stream_filter_append</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'convert.base64-encode'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"This is a test.\n"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* Outputs: VGhpcyBpcyBhIHRlc3QuCg== */<br /><br /></span><span style="color: #0000BB">$param </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'line-length' </span><span style="color: #007700">=> </span><span style="color: #0000BB">8</span><span style="color: #007700">, </span><span style="color: #DD0000">'line-break-chars' </span><span style="color: #007700">=> </span><span style="color: #DD0000">"\r\n"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'php://output'</span><span style="color: #007700">, </span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">stream_filter_append</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'convert.base64-encode'</span><span style="color: #007700">, </span><span style="color: #0000BB">STREAM_FILTER_WRITE</span><span style="color: #007700">, </span><span style="color: #0000BB">$param</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"This is a test.\n"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* Outputs: VGhpcyBp<br /> : cyBhIHRl<br /> : c3QuCg== */<br /><br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'php://output'</span><span style="color: #007700">, </span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">stream_filter_append</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'convert.base64-decode'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"VGhpcyBpcyBhIHRlc3QuCg=="</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* Outputs: This is a test. */<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> <p class="simpara"> <i>convert.quoted-printable-encode</i> and <i>convert.quoted-printable-decode</i> Use of the decode version of this filter is equivalent to processing all stream data through the <a href="function.quoted-printable-decode.html" class="function">quoted_printable_decode()</a> functions. There is no function equivalent to <i>convert.quoted-printable-encode</i>. <i>convert.quoted-printable-encode</i> supports parameters given as an associative array. In addition to the parameters supported by <i>convert.base64-encode</i>, <i>convert.quoted-printable-encode</i> also supports boolean arguments <i><tt class="parameter">binary</tt></i> and <i><tt class="parameter">force-encode-first</tt></i>. <i>convert.base64-decode</i> only supports the <i><tt class="parameter">line-break-chars</tt></i> parameter as a type-hint for striping from the encoded payload. </p> <div class="example"> <p><b>Example #2 convert.quoted-printable-encode & convert.quoted-printable-decode </b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br />$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #DD0000">'php://output'</span><span style="color: #007700">, </span><span style="color: #DD0000">'w'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">stream_filter_append</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">'convert.quoted-printable-encode'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"This is a test.\n"</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">/* Outputs: =This is a test.=0A */<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="filters.html">List of Available Filters</a></div> <div class="next" style="text-align: right; float: right;"><a href="filters.compression.html">Compression Filters</a></div> <div class="up"><a href="filters.html">List of Available Filters</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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