php base64_decode 函数是php编程中用于解码base64编码字符串的重要函数。通过base64_decode函数，可以将经过base64编码的字符串解码成原始的数据，方便在数据传输和存储过程中使用。本文将介绍base64_decode函数的基本语法和用法，帮助读者更好地理解和运用该函数。如果您对php编程和数据处理感兴趣，那么不妨继续阅读，了解更多关于php base64_decode函数的知识。
base64_decode() 是 php 的内置函数，最常用于网络上的邮件功能。
函数语法：
<code><code class="php hljs" data-lang="php"><span style="display:flex;"><span>string base64_decode( <span style="color:#19177c">$string</span>, <span style="color:#19177c">$strict</span>) </span></span></code></code>
它需要两个参数。
$string - 用于存储编码数据，是必须的。$strict - 虽然此参数不像前者那样是强制性的，但当它设置为 TRUE, 时，base64_decode 将返回 FALSE，前提是它的输入包含函数字母表以外的数据。否则，无效数据将被自动丢弃。返回值：
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base64 解码函数在失败的情况下返回 FALSE，并可能返回二进制值。
<code><code class="php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"><?</span>php </span></span><span style="display:flex;"><span><span style="color:#19177c">$string</span> <span style="color:#666">=</span> base64_encode (<span style="color:#ba2121">'Your string values are encoded'</span>); </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"1.Here is the encoded funct<strong class="keylink">io</strong>n value in a <strong class="keylink">Mac</strong>hine readable f<strong class="keylink">ORM</strong>at = "</span><span style="color:#666">.</span><span style="color:#19177c">$string</span> <span style="color:#666">.</span><span style="color:#ba2121">"<br>"</span>; </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#ba2121">"2.The function decodes the formerly encoded string value"</span> <span style="color:#666">.</span><span style="color:#ba2121">"<br>"</span> <span style="color:#666">.</span>base64_decode(<span style="color:#19177c">$string</span>); </span></span><span style="display:flex;"><span><span style="color:#bc7a00">?></span><span > </span></span></span></code></code>
输出：
<code><code class="text hljs" data-lang="text"><span style="display:flex;"><span>1.Here is the encoded function value in a machine readable </span></span><span style="display:flex;"><span>format = WW91ciBzdHJpbmcgdmFsdWVzIGFyZSBlbmNvZGVk </span></span><span style="display:flex;"><span>2. The function decodes the formerly encoded string value </span></span><span style="display:flex;"><span>Your string values are encoded. </span></span></code></code>
示例代码显示了 base64_decode() 函数如何在一个简单的场景中工作。
为了对编码数据进行解码，程序为变量赋值，然后与解码函数一起使用。
而输出表明 base64_decode() 如何将数据转换回用户可读格式。
<code><code class="php hljs" data-lang="php"><span style="display:flex;"><span><span style="color:#666"><?</span>php </span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//The following variable is assigned with a string set </span></span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic"></span><span style="color:#19177c">$string</span> <span style="color:#666">=</span> <span style="color:#ba2121">"HELLO--こんにちは--你好"</span>; </span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//string cont<strong class="keylink">ai</strong>ns bilingual text </span></span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//base64 is used to encode the data first into the $enco variable </span></span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic"></span><span style="color:#19177c">$enco</span> <span style="color:#666">=</span> base64_encode (<span style="color:#19177c">$string</span>); </span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic">//finally the base64_decode functionis used to decode the encoded value </span></span></span><span style="display:flex;"><span><span style="color:#408080;font-style:italic"></span><span style="color:#19177c">$deco</span> <span style="color:#666">=</span> base64_decode (<span style="color:#19177c">$enco</span>); </span></span><span style="display:flex;"><span><span style="color:#008000;font-weight:bold">echo</span> <span style="color:#19177c">$deco</span>; </span></span><span style="display:flex;"><span><span style="color:#bc7a00">?></span><span > </span></span></span></code></code>
输出：
<code><code class="text hljs" data-lang="text"><span style="display:flex;"><span>HELLO--こんにちは--你好 </span></span></code></code>
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