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<?php
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//如果变量后边还有字符串的话，就需要将变量与后面的字符串使用空格分开，或者使用大括号{ }将变量包裹起来
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$a='hello';
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$str1="$a是你好<br>";
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$str2="{$a}是你好<br>";
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echo $str1;
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echo $str2;
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?>
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