There will be a verification code when logging in. After looking at the code, its src points to a PHP address (maybe not a PHP address, so src="/login/verificationCode?0.8308222951445625"
). When I open this address alone, garbled characters appear. , how can I cut out this picture? Prepare for the next step of identifying the verification code. Have you ever done any research on this? Thank you!
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There will be a verification code when logging in. After looking at the code, its src points to a PHP address (maybe not a PHP address, so src="/login/verificationCode?0.8308222951445625"
). When I open this address alone, garbled characters appear. , how can I cut out this picture? Prepare for the next step of identifying the verification code. Have you ever done any research on this? Thank you!
This is not garbled code, it is just a binary stream of jpg, gif, and png. Whether it is jpeg or png, you need to look at the first few characters of the binary stream. Last time, there were marks such as JPEG
Save this binary stream as 1.jpg
and you can see the result
Or when requesting, set the content-type to image/jpeg so that the request should be visible directly
It is recommended that the questioner take a look at the TP verification code generation to understand the meaning of it
Verification code
I encountered the same problem
Just add a header to the http request to let the server know that it is a picture. The garbled code you are talking about is a binary stream. Copy it to .txt and save it as .jpg to open it and see it
Generally, verification code images are generated without storage or caching.
Revisiting the link will only generate a new image, so you need to store the image first and then call it.
In the previous project, we used js to call the interface and encrypted the binary stream resource of the verification code image to the client with base64_encode.
You can refer to the implementation method
Has the poster solved this problem? I'm encountering this problem too.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。


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