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echo为什么后面有时候加“”，有时候不加引号？echo的作用是什么？

phpcn_u233phpcn_u2332833 days ago2186

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  • 数据分析师

    数据分析师2017-09-30 22:56:05

    Why is echo sometimes followed by "" and sometimes not quoted? What is the function of echo? -PHP Chinese website Q&A-Why is echo sometimes followed by "" and sometimes not quoted? What is the function of echo? -PHP Chinese website Q&A

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  • 阿神

    阿神2016-12-19 16:41:37

    加引号是修饰的是字符串,单引号是不解析引号内的内容,不能不带引号吧,echo的作用是输出的意思

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    • phpcn_u2293

    You can use it without quotation marks, for example $a=5;$b=3; echo $a+$b;

    — phpcn_u2293 · 2017-05-18 10:44:51
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