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echo、print、print_r、var_dump 区别 | 路遥
http://blog.gouzx.cn/2019/07/09/difference-echo-print-print_r-var_dump-in-php/
echo 输出单个或多个字符,多个使用逗号分隔 无返回值 1echo "String 1", "String 2"; print 只可以输出单个字符 返回1,因此可用于表达式 12print "Hello";if ($expr && print "foo") {} print_r 输出关于变量的易于理解的信息 支持多种数据类型,包括字符、数组、对象,格式
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