


Examples of advanced usage of file_get_contents in PHP, filegetcontents
The example in this article describes the advanced usage of file_get_contents in PHP and is shared with everyone for your reference. The specific analysis is as follows:
First solve the timeout problem of file_get_contents. After the timeout returns an error, make a try like settimeout in js. After more than 3 or 5 errors, it will be confirmed that it cannot connect to the server and give up completely.
Here are two simple solutions:
1. Increase the time limit for timeout
Note: set_time_limit only sets the timeout of your PHP program, not the timeout of the file_get_contents function reading the URL.
I initially thought that set_time_limit could also affect file_get_contents, but it was later tested to be invalid. To truly modify the file_get_contents delay, you can use the timeout parameter of resource $context:
The PHP program code is as follows:
$opts = array( 'http'=>array( 'method'=>"GET", 'timeout'=>60, ) ); $context = stream_context_create($opts); $html =file_get_contents('http://www.bkjia.com', false, $context); fpassthru($fp);
2. Multiple attempts
The PHP program code is as follows:
$cnt=0; while($cnt < 3 && ($str=@file_get_contents('http...'))===FALSE){ $cnt++; }
The above method is OK for dealing with timeouts. Next, we will demonstrate using file_get_contents to implement Post, as follows:
PHP program code
function Post($url, $post = null){ $context = array(); if (is_array($post)) { ksort($post); $context['http'] = array ( 'timeout'=>60, 'method' => 'POST', 'content' => http_build_query($post, '', '&'), ); } return file_get_contents($url, false, stream_context_create($context)); } $data = array ( 'name' => 'test', 'email' => 'test@gmail.com', 'submit' => 'submit', ); echo Post('http://www.bkjia.com', $data);
Pay attention to Set_time_out in the document header, otherwise the entire document will time out.
I hope this article will be helpful to everyone’s learning of PHP programming.
file_get_contents() reads the contents of a file, including remote files!!
file_get_contents() function is the preferred method for reading the contents of a file into a string!!
echo file_get_contents('www.baidu.com');
?>
This context refers to "content in the stream".
We know that OS operations are controlled by input and output flows.
When opening some special files (everything under Unix is a file), such as devices, keyboards, screens, network files, and serial ports,
requires input streams to perform some operations. At this time, use stream_context_create to create an "input content".
The actual main use is that most examples are also used to perform HTTP operations (the actual use is far from limited to this function)
Using the content of the HTTP header as the content of the input stream, this Get the content returned by the service after opening the file in this way.
In principle, it still operates on the input and output streams of system files.
$opts = array(
'http'=>array(
'method'=>"GET",
'header'=> ;"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n"
)
);
$context = stream_context_create($opts);
//Submit language encoding and cookies to get the response content of a URL
$file = file_get_contents('www.example.com/', false, $context);
?>
I hope it won’t be a tragedy. I couldn’t understand it after talking for a long time

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。

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。

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)”。


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