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                [TOC] * * * * * ### 一. 字符串的定義方式 * 單引號, 雙引號, heredoc 和 newdoc; ### 二. 區別 * 單引號不能解析變量; * 單引號不能解析轉義字符, 只能解析單引號和反斜線本身; * 變量和變量, 變量和字符串, 字符串和字符串之間可以用 **.** 連接; * * 雙引號可以解析變量, 變量可以用特殊字符和 { } 包含; * 雙引號可以解析所有的轉義字符; * 也可以用 **.** 連接; * * 單引號效率更高 ### 三. Heredoc 結構的字符串示例 ~~~ echo <<<EOT My name is "$name". I am printing some $foo->foo. Now, I am printing some {$foo->bar[1]}. This should print a capital 'A': \x41 EOT; // 打印結果 My name is "MyName". I am printing some Foo. Now, I am printing some Bar2. This should print a capital 'A': A ~~~ ### 四. Nowdoc 結構字符串示例 ~~~ // 打印結果 My name is "$name". I am printing some $foo->foo. Now, I am printing some {$foo->bar[1]}. This should not print a capital 'A': \x41 ~~~
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