How to clear cookies in php: First create a cookie through setcookie; then use the "setcookie('test',time() - 3600);" method to clear the created cookie.
Recommended: "PHP Video Tutorial"
PHP Clear COOKIE? PHP cannot delete COOKIE? Set the COOKIE validity period
PHP transparently supports HTTP cookies. Cookies are a mechanism that stores data on the remote browser side and uses it to track and identify users. You can use the
setcookie() or setrawcookie() function to set cookies. Cookies are part of the HTTP header, so the setcookie() function must be called before
other information is output to the browser. , which is similar to the restriction on the header() function.
setcookie();
The way to delete a cookie is to set the validity period of this cookie to before the current time.
setcookie('test', 'true', time() + 300); // 创建 cookie //setcookie('test',time() - 3600 ); // 清除建立的 cookie //setcookie('test'); //只是将 $_COOKIE['test'] 的值清空 如果直接setcookie('test', ''); echo ' '; print_r($_COOKIE); //attay();
You will find that the $_COOKIE array is empty, not just $_COOKIE['test'] is empty , so winsock captured the packet and observed the returned
http header. It turned out to be: set-cookie:test=deleted; expires=Mon, 29-May-2014 10:22:15 GMT
Login:
setcookie('username', 'zhangsan', time()+1000, "/php100");
Exit:
setcookie('username', '', time()-3600);
I found that there is no problem under IE when exiting, but when tested in Firefox, the login is normal and cannot exit. Check IE and Firefox After testing, I found out that the fourth parameter (legal path parameter) of setcookie() was not specified, so the cookie path set when logging in and exiting was different (Firefox is more strict, As a result, various variables were rebuilt)
It was found that there was no problem under IE when exiting, but when tested in Firefox, the login was normal and unable to exit. Check the difference in cookie records in IE and Firefox, and after testing
I discovered that the fourth parameter (legal path parameter) of setcookie() was not specified, so the path of the cookie set when logging in and exiting was different (Firefox is stricter, resulting in the reconstruction of each variable)
Example:
$value = 'something'; setcookie('TestCookie', $value, time() + 3600); setcookie('mytest', $value, time() + 3600, "~rasmus", ".maoge.com", 1); if (isset($_COOKIE['TestCookie'])) { echo 'TestCookie :' . $_COOKIE['TestCookie']; }
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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