substr_replace

实例

例子 1

把 "Hello" 替换成 "world"：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">substr_replace</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Hello"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"world"</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 2

从字符串的第 6 个位置开始替换（把 "world" 替换成 "Shanghai"）：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">substr_replace</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Hello world"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"Shanghai"</span><span class="token punctuation">,</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 3

从字符串结尾的第 5 个位置开始替换（把 "world" 替换成 "Shanghai"）：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">substr_replace</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"Hello world"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"Shanghai"</span><span class="token punctuation">,</span><span class="token operator">-</span><span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 4

在 "world" 开头插入 "Hello"：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">echo</span> <span class="token function">substr_replace</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"world"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"Hello "</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">,</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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例子 5

一次性替换多个字符串。把每个字符串中的 "AAA" 替换成 "BBB"：

<span class="token php language-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$replace</span> <span class="token operator">=</span> <span class="token keyword">array</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"1: AAA"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"2: AAA"</span><span class="token punctuation">,</span><span class="token string double-quoted-string">"3: AAA"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">echo</span> <span class="token function">implode</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"<br>"</span><span class="token punctuation">,</span><span class="token function">substr_replace</span><span class="token punctuation">(</span><span class="token variable">$replace</span><span class="token punctuation">,</span><span class="token string single-quoted-string">'BBB'</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">,</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token delimiter important">?></span></span>

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