PHP中的赋值运算符
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<p>运算符的赋值运算</p>
<p><?</p>
<p>$a = ($b =4)+5; //$a = 变成了9 而且 $b = 4</p>
<p>?></p>
<pre><code><?php
$a = 3;
$a += 5; // 设置 $a 为 8 ，之前说过： $a = $a + 5;
$b = "Hello ";
$b .= "There!"; // 设置 $b 为 "Hello There!"，就像 $b = $b . "There!";
?></code></pre>
<h3>算术赋值运算符</h3>
<table><thead><tr><th>例子</th><th>等同于</th><th>操作</th></tr></thead><tbody><tr><td>$a += $b</td><td>$a = $a + $b</td><td>加法</td></tr><tr><td>$a -= $b</td><td>$a = $a - $b</td><td>减法</td></tr><tr><td>$a *= $b</td><td>$a = $a * $b</td><td>乘法</td></tr><tr><td>$a /= $b</td><td>$a = $a / $b</td><td>除法</td></tr><tr><td>$a %= $b</td><td>$a = $a % $b</td><td>取模</td></tr><tr><td>$a **= $b</td><td>$a = $a ** $b</td><td>指数</td></tr></tbody></table>
<h3>位赋值运算符</h3>
<table><thead><tr><th>例子</th><th>等同于</th><th>操作</th></tr></thead><tbody><tr><td>$a &= $b</td><td>$a = $a & $b</td><td>按位与</td></tr><tr><td>$a |= $b</td><td>$a = $a | $b</td><td>按位或</td></tr><tr><td>$a ^= $b</td><td>$a = $a ^ $b</td><td>按位异或</td></tr><tr><td>$a <<= $b</td><td>$a = $a << $b</td><td>左移</td></tr><tr><td>$a >>= $b</td><td>$a = $a >> $b</td><td>右移</td></tr></tbody></table>
<h3>其他赋值运算符</h3>
<table><thead><tr><th>例子</th><th>等同于</th><th>操作</th></tr></thead><tbody><tr><td>$a .= $b</td><td>$a = $a . $b</td><td>字符串拼接</td></tr><tr><td>$a ??= $b</td><td>$a = $a ?? $b</td><td>NULL 合并</td></tr></tbody></table>
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