print_r

名称:print_r

分类:变量处理

所属语言:php

一句话介绍:以人类可读的方式打印有关变量的信息。

实例

以更易读的方式打印一些变量的信息：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$a</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"red"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"green"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"blue"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token variable">$a</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">echo</span> <span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">;</span>

<span class="token variable">$b</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Peter"</span><span class="token operator">=></span><span class="token string double-quoted-string">"35"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"Ben"</span><span class="token operator">=></span><span class="token string double-quoted-string">"37"</span><span class="token punctuation">,</span> <span class="token string double-quoted-string">"Joe"</span><span class="token operator">=></span><span class="token string double-quoted-string">"43"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token variable">$b</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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