Untitled
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| Language | PHP |
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| Owner | w3xue |
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| Modified | |
| Visibility | Public |
<?php
$a = "Hello";
$b = $a . " world!";
echo $b; // 输出 Hello world!
$x="Hello";
$x .= " world!";
echo $x; // 输出 Hello world!
?>
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