This article mainly introduces the five methods of requesting URLs in PHP. Interested friends can refer to it. I hope it will be helpful to everyone.
Five methods:
The first three are the basic file operation functions of PHP
curl()
is a PHP extension that needs to be enabled and installed under Linux.exec()
is executed The command wget under the linux command line downloads remote files
. The wget command failed when testing the local virtual machine to request http://www.baidu.com, but failed on the remote server. Yes, considering the problem of DNS resolution, I directly requested the IP and successfully downloaded the index.html file.
Only methods are provided here. The advantages and disadvantages require a detailed understanding of the functions and defects of each method.
1. fopen() function
$file = fopen("http://www.jb51.net", "r") or die("打开远程文件失败!"); while (!feof($file)) { $line = fgets($file, 1024); //使用正则匹配标题标记 if (preg_match("/<title>(.*)<\/title>/i", $line, $out)) { $title = $out[1]; //将标题标记中的标题字符取出 break; //退出循环,结束远程文件读取 } } fclose($file);
2 , file() function
$lines = file("http://www.jb51.net/article/48866.htm"); readfile(http://www.jb51.net/article/48866.htm);
##3. file_get_contents() function
$content = file_get_contents(http://www.jb51.net/article/48866.htm);
##4. Curl() requests remote url data
$url = "http://www.baidu.com"; $ch = curl_init(); $timeout = 5; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $contents = curl_exec($ch); curl_close($ch);
5. exec() executes the command line command##
//exec("wget 220.181.111.188"); shell_exec("wget 220.181.111.188");
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urlThe above is the detailed content of Five ways to request url in php. For more information, please follow other related articles on the PHP Chinese website!

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。

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。

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。

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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