PHP Base64_decode 函数

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="language-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。

1. $string - 用于存储编码数据，是必须的。
2. $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：

base64 解码函数在失败的情况下返回 FALSE，并可能返回二进制值。失败的情况下返回 FALSE，并可能返回二进制值。

PHP Base64_decode 函数示例代码 1

<code><code class="language-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="language-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()

PHP Base64_decode 函数示例代码 1

---

<code><code class="language-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>

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输出：

<code><code class="language-text hljs" data-lang="text"><span style="display:flex;"><span>HELLO--こんにちは--你好
</span></span></code></code>

示例代码显示了

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