


What is the function of php parse_str() function?
The parse_str() function in PHP parses the query string into variables. Its syntax is as follows:
Syntax
parse_str(string,array)
Parameter details:
Parameter | Description |
---|---|
string | Required. Specifies the string to be parsed. |
array | Optional. Specifies the name of the array in which the variable is stored. This parameter indicates that the variable will be stored in an array. If a second variable array is set, the variable will be stored in this array as an array element instead. |
PS: If the array parameter is not set, the variables set by this function will overwrite the existing variables with the same name.
PS: The magic_quotes_gpc setting in the php.ini file affects the output of this function. If enabled, variables are converted by addslashes() before being parsed by parse_str() .
If string is the query string passed in by the URL, it is parsed into a variable and set to the current scope.
To get the current QUERY_STRING, you can use the $_SERVER['QUERY_STRING'] variable.
Example 1
Parse the query string into variables:
<?php parse_str("name=Bill&age=60"); echo $name."<br>"; echo $age; ?>
Code running results:
Example 2
Storing variables in the array:
<?php parse_str("name=Bill&age=60",$myArray); print_r($myArray); ?>
Code running results:
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Detailed explanation of the definition and usage of php parse_url() function
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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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