Advanced application of PHP file processing - file pointer PHP can realize the positioning and query of file pointers, thereby realizing fast query of required information. The file pointer functions include rewind(), fseek(), feof() and ftell() function. In the previous article "Advanced Application of PHP File Processing—Remote File Access and Locking Files" we introduced remote access to files and how to lock files. Friends who haven't read it can go and take a look. I won't cover it here. Enough talk, today we mainly talk about the functions in the file pointer! 1: rewind() function This function sets the pointer of the file handle to the beginning of the file stream. The syntax format of this function is as follows: bool rewind (resource $handle) Note: If the file is opened in append ("a") mode, then Any data written to a file will always be appended to the end of the existing contents of the file, regardless of the position of the file pointer! 2: fseek() function The fseek() function realizes the positioning of the file pointer. The syntax format of this function is as follows:
1. Advanced application of PHP file processing - file pointer
Introduction: PHP can realize the positioning and query of file pointers, thereby realizing quick query of the required information. The file pointer function has rewind(), fseek(), feof() and ftell() functions.
2. php Summary of methods to get the number of lines in a file
##Introduction: This article introduces three ways to get the number of file lines in PHP. The first method is to use the feof and fgets functions, the second method is to use the stream_get_line function, and the third method is to use the count function. , please see the following example for specific implementation
3. The correct way to read files with PHP
Introduction: Roger McCoy (rogermccoy@gmail.com), IT Specialist, Freelance Writer March 06, 2007 Learn how to use PHP's various file functions. Review basic file functions such as fopen, fclose, and feof; learn about read functions such as fgets, fgetss, and fscanf. And found functions that process entire files in one or two lines of code. Let's count how many ways there are to handle...
Introduction: php feof function
5. The correct way to read files with PHP
Introduction: Learn how to use PHP's various file functions. Review basic file functions such as fopen, fclose, and feof; learn about read functions such as fgets, fgetss, and fscanf. And found functions that process entire files in one or two lines of code. Let’s count how many ways there are One of the joys of working with a modern programming language like PHP is the sheer number of options available. PHP can easily win Perl's motto "There's more than ...
6. The correct way to read files with PHP
Introduction: Learn how to use PHP's various file functions. View basic file functions such as fopen, fclose, and feof; learn about functions such as fgets, Reading functions like fgetss and fscanf and discovering functions that process an entire file in one or two lines of code. Let's count how many ways there are. One of the joys of working with a modern programming language like PHP is that there are a ton of them. Options available. PHP can easily live up to Perl's motto "There's more than ...
7. How PHP uses the feof() function to read files
Introduction: How PHP uses the feof() function to read files
Introduction: Human Resources Document No. 10774 of the Ministry of Human Resources and Social Security: Document No. 10774 of the Ministry of Human Resources and Social Security. PHP text file reading efficiency: The homepage is about 3KB. The copy code for local testing is as follows: file_get_contents('shadow.xml'); Time-consuming It takes 0.0003 seconds to copy the code. The code is as follows: $indexFile = fopen('shadow.xml', 'r');while ( !feof($indexFile)) fgetc( $indexFile); It takes 0.026 seconds to copy the code. The code is as follows: $indexFile
9. galaxy s4 active Implementation code to determine the end of the HTTP request in Keep-Alive mode
Introduction: galaxy s4 active:galaxy s4 active Implementation code to determine the end of HTTP request in Keep-Alive mode: Therefore, the end of a request can be determined based on EOF. The following code (PHP) is very common: Copy the code code as follows:// $fp is The handle generated by fsockopen() while(!feof($fp)) { echo fgets($fp); } (Note: The short connection mode is marked with "Connection: close" in the header, and the long connection is marked with "Connection: keep -alive" mark. Currently HTTP/1.0 defaults
10. fop PHP implementation code for reading web page file content fopen, curl, etc.
Introduction: fop:fop PHP implementation code for reading web page file content fopen, curl, etc.: 1. fopen implementation code: Copy the code as follows:
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($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。

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。

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。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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