为什么md5('240610708')等于md5('QNKCDZO')? [英] Why md5('240610708') is equal to md5('QNKCDZO')?

问题描述

var_dump(md5('240610708') == md5('QNKCDZO'));

输出:

bool(true)

示例: http://3v4l.org/2vrMi

推荐答案

md5('240610708')的结果是0e462097431906509019562988736854.

md5('QNKCDZO')的结果是0e830400451993494058024219903391.

它们都是浮点数格式字符串(数字字符串)，如果您在php中使用==，则在将数字与字符串进行比较或比较涉及数字字符串，然后将每个字符串转换为数字，然后以数字方式进行比较.

They are both float number format strings (numerical strings), and if you use == in php, when compare a number with a string or the comparison involves numerical strings, then each string is converted to a number and the comparison performed numerically.

与==相比，这两个字符串都转换为0，如果要将它们作为字符串进行比较，请记住改用===(严格比较).

Both of the strings are converted to 0 when compared with ==, if you want to compare them as string, remember to use ===(strict comparison) instead.

请参阅: PHP表示两个不同的字符串保持一致

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