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1. PHP How to lock a file_PHP tutorial
Introduction: How to lock a file under PHP? ?php /* *lock_thisfile: Obtain exclusive lock*@param. $tmpFileStr is the file name used as the shared lock file (you can give it any name) *@param $locktype lock type, the default is false (not
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Introduction: The difference between php creating temporary files tempnam and tmpfile. The tempnam() function creates a temporary file with a unique file name. If successful, the function returns the new temporary file name. If it fails, it returns false. The tempnam() function creates a
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Simple page buffering technology
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Comment mailbox for learning PHP by example
Introduction: Examples of Learning PHP's Opinion Mailbox6.
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Is there any functional solution for obtaining information from image files opened by fopen?
Introduction: Is there a function getimagesize() that obtains information for image files opened by fopen? The parameter passed is the image file path. If I only know tmpfile() or fopen( ) What should I do with the returned file handle? Do I have to temporarily save it to the hard disk? ------solution-------------------- It’s best to save it. If you don’t use the GD function, it will be complicated. You have to parse the image binary data yourself to get its original number9.
How to create with PHP Unique temporary files
# Introduction: How to create unique temporary files with PHP $tmpfile = tempnam( getcwd()."/", "TMP" ); // Create a unique temporary file tempnam – Create a file with a unique filename Syntax: string tempnam (string dir, string prefix) tempnam is created in the specified directory with the prefix as10.
Introduction to DirectoryIterator and RecursiveDirectoryIterator in php
: DirectoryIterator and RecursiveDirectoryIterator in php In php, you can use DirectoryIterator to obtain files or directories in a specified directory. $path = "/tmp"; $oDir = new DirectoryIterator($path); foreach($oDir as $file)【Related Q&A Recommendations】:
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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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