PHP learning--parse URL, php--url
There are two methods in PHP that can be used to parse URLs, namely parse_url and parse_str.
parse_url
Parse the URL and return its component parts
mixed parse_url ( string $url [, int $component = -1 ] )
This function parses a URL and returns an associative array containing the various components that appear in the URL.
This function is not used to verify the validity of the given URL, but to break it down into the parts listed below. Incomplete URLs are also accepted and parse_url() will try to parse them as correctly as possible.
Parameters
url The URL to parse. Invalid characters will be replaced with _.
component Specify one of PHP_URL_SCHEME, PHP_URL_HOST, PHP_URL_PORT, PHP_URL_USER, PHP_URL_PASS, PHP_URL_PATH, PHP_URL_QUERY or PHP_URL_FRAGMENT to get the string of the specified part of the URL. (Except when specified as PHP_URL_PORT, an integer value will be returned).
Return value
For severely unqualified URLs, parse_url() may return FALSE.
If the component parameter is omitted, an associative array array will be returned, and at least one element will currently be in the array. The possible keys in the array are:
- scheme - like http
- host
- port
- user
- pass
- path
- query - after the question mark ?
- fragment - after the hash symbol #
If the component argument is specified, parse_url() returns a string (or an integer when specified as PHP_URL_PORT) instead of an array. If the specified component in the URL does not exist, NULL will be returned.
Example
<?<span>php </span><span>$url</span> = 'http://username:password@hostname/path?arg=value#anchor'<span>; </span><span>print_r</span>(<span>parse_url</span>(<span>$url</span><span>)); </span><span>echo</span> <span>parse_url</span>(<span>$url</span>,<span> PHP_URL_PATH); </span>?>
The above routine will output:
<span>Array</span><span> ( [scheme] </span>=><span> http [host] </span>=><span> hostname [user] </span>=><span> username [pass] </span>=><span> password [path] </span>=> /<span>path [query] </span>=> arg=<span>value [fragment] </span>=><span> anchor ) </span>/path
parse_str
Parse the string into multiple variables
void parse_str ( string $str [, array &$arr ] )
If str is the query string passed in by the URL, parse it into a variable and set it to the current scope.
To get the current QUERY_STRING, you can use the $_SERVER['QUERY_STRING'] variable.
Parameters
str The input string.
arr If the second variable arr is set, the variable will be stored in this array as an array element instead. ,
Example
<?<span>php </span><span>$str</span> = "first=value&arr[]=foo+bar&arr[]=baz"<span>; </span><span>parse_str</span>(<span>$str</span><span>); </span><span>echo</span> <span>$first</span>; <span>//</span><span> value</span> <span>echo</span> <span>$arr</span>[0]; <span>//</span><span> foo bar</span> <span>echo</span> <span>$arr</span>[1]; <span>//</span><span> baz</span> <span>parse_str</span>(<span>$str</span>, <span>$output</span><span>); </span><span>echo</span> <span>$output</span>['first']; <span>//</span><span> value</span> <span>echo</span> <span>$output</span>['arr'][0]; <span>//</span><span> foo bar</span> <span>echo</span> <span>$output</span>['arr'][1]; <span>//</span><span> baz</span> ?>
I was reading the source code of php-resque some time ago and saw the application of these two methods. I feel that they are used very well to parse the settings of the redis link.
The format of the redis link is: redis://user:pass@host:port/db?option1=val1&option2=val2. Is it the same as the URL, so it is easy to parse using the above two methods.
Address: https://github.com/chrisboulton/php-resque/blob/master/lib/Resque/Redis.php
The code is as follows:
<span>/*</span><span>* * Parse a DSN string, which can have one of the following formats: * * - host:port * - redis://user:pass@host:port/db?option1=val1&option2=val2 * - tcp://user:pass@host:port/db?option1=val1&option2=val2 * * Note: the 'user' part of the DSN is not used. * * @param string $dsn A DSN string * @return array An array of DSN compotnents, with 'false' values for any unknown components. e.g. * [host, port, db, user, pass, options] </span><span>*/</span> <span>public</span> <span>static</span> <span>function</span> parseDsn(<span>$dsn</span><span>) { </span><span>if</span> (<span>$dsn</span> == ''<span>) { </span><span>//</span><span> Use a sensible default for an empty DNS string</span> <span>$dsn</span> = 'redis://' . self::<span>DEFAULT_HOST; } </span><span>$parts</span> = <span>parse_url</span>(<span>$dsn</span><span>); </span><span>//</span><span> Check the URI scheme</span> <span>$validSchemes</span> = <span>array</span>('redis', 'tcp'<span>); </span><span>if</span> (<span>isset</span>(<span>$parts</span>['scheme']) && ! <span>in_array</span>(<span>$parts</span>['scheme'], <span>$validSchemes</span><span>)) { </span><span>throw</span> <span>new</span> \InvalidArgumentException("Invalid DSN. Supported schemes are " . <span>implode</span>(', ', <span>$validSchemes</span><span>)); } </span><span>//</span><span> Allow simple 'hostname' format, which `parse_url` treats as a path, not host.</span> <span>if</span> ( ! <span>isset</span>(<span>$parts</span>['host']) && <span>isset</span>(<span>$parts</span>['path'<span>])) { </span><span>$parts</span>['host'] = <span>$parts</span>['path'<span>]; </span><span>unset</span>(<span>$parts</span>['path'<span>]); } </span><span>//</span><span> Extract the port number as an integer</span> <span>$port</span> = <span>isset</span>(<span>$parts</span>['port']) ? <span>intval</span>(<span>$parts</span>['port']) : self::<span>DEFAULT_PORT; </span><span>//</span><span> Get the database from the 'path' part of the URI</span> <span>$database</span> = <span>false</span><span>; </span><span>if</span> (<span>isset</span>(<span>$parts</span>['path'<span>])) { </span><span>//</span><span> Strip non-digit chars from path</span> <span>$database</span> = <span>intval</span>(<span>preg_replace</span>('/[^0-9]/', '', <span>$parts</span>['path'<span>])); } </span><span>//</span><span> Extract any 'user' and 'pass' values</span> <span>$user</span> = <span>isset</span>(<span>$parts</span>['user']) ? <span>$parts</span>['user'] : <span>false</span><span>; </span><span>$pass</span> = <span>isset</span>(<span>$parts</span>['pass']) ? <span>$parts</span>['pass'] : <span>false</span><span>; </span><span>//</span><span> Convert the query string into an associative array</span> <span>$options</span> = <span>array</span><span>(); </span><span>if</span> (<span>isset</span>(<span>$parts</span>['query'<span>])) { </span><span>//</span><span> Parse the query string into an array</span> <span>parse_str</span>(<span>$parts</span>['query'], <span>$options</span><span>); } </span><span>return</span> <span>array</span><span>( </span><span>$parts</span>['host'], <span>$port</span>, <span>$database</span>, <span>$user</span>, <span>$pass</span>, <span>$options</span>,<span> ); }</span>

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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