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php中这个mysql语句的语法怎么处理？

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php中这个mysql语句的语法怎么处理？

php中这个mysql语句的语法怎么处理？
如下图所示，问题在红框中：

clipboard.png

问题：
红框中那一串字符有$符号，会被认为是php变量，应该怎么处理？加转义符？


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by (71.8m points)

不放在双引号里就不会解析


与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
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