Briefly explain the above code. The function of get_headers is to access a remote address and return the HTTP headers sent by the server in the form of an array. And $header[0] is the status code returned by the server (if nothing else happens, the status code should be the first one returned).
To determine that a file exists on the remote server, just make sure that the status code returned by accessing the file is "HTTP/1.1 200 OK" (of course you can also determine if the status code is not "HTTP/1.1 404 Not Found") Then the file exists, but it always feels unsafe. After all, there are other status codes such as 301, 400).
Example of obtaining three-digit HTTP response code:
function get_http_response_code($theURL) {
$headers = get_headers($theURL);
Return substr($headers[0], 9, 3);
}
?>
Example of excluding redirects:
/**
* Fetches all the real headers sent by the server in response to a HTTP request without redirects
* Get headers without redirection
*/
function get_real_headers($url,$format=0,$follow_redirect=0) {
if (!$follow_redirect) {
//set new default options
$opts = array('http' =>
array('max_redirects'=>1,'ignore_errors'=>1)
);
Stream_context_get_default($opts);
}
//get headers
$headers=get_headers($url,$format);
//restore default options
if (isset($opts)) {
$opts = array('http' =>
array('max_redirects'=>20,'ignore_errors'=>0)
);
Stream_context_get_default($opts);
}
//return
Return $headers;
}
?>
Fixed link to this article: http://www.xssxss.com/fuck/323.xss | Shine’s Holy Paradise-〃Min〃

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。

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。

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。

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。

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。


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