fgetcsv(resource fp,int length [, string delimiter , string enclosure, escape]])
请把红色的部分解释一下。写个例子。
绿色是干什么的
回复讨论(解决方案)
array fgetcsv ( resource $handle [, int $length = 0 [, string $delimiter = ',' [, string $enclosure = '"' [, string $escape = '\\' ]]]] )
和 fgets() 类似,只除了 fgetcsv() 解析读入的行并找出 CSV 格式的字段然后返回一个包含这些字段的数组。
参数 ¶
handle
一个由 fopen()、 popen() 或 fsockopen() 产生的有效文件指针。
length
必须大于 CVS 文件内最长的一行。在 PHP 5 中该参数是可选的。如果忽略(在 PHP 5.0.4 以后的版本中设为 0)该参数的话,那么长度就没有限制,不过可能会影响执行效率。
delimiter
设置字段分界符(只允许一个字符)。
enclosure
设置字段环绕符(只允许一个字符)。
escape
设置转义字符(只允许一个字符),默认是一个反斜杠。
PHP fgetcsv() 函数
array fgetcsv ( resource $handle [, int $length = 0 [, string $delimiter = ',' [, string $enclosure = '"' [, string $escape = '\\' ]]]] )
和 fgets() 类似,只除了 fgetcsv() 解析读入的行并找出 CSV 格式的字段然后返回一个包含这些字段的数组。
参数 ¶
handle
一个由 fopen()、 popen() 或 fsockopen() 产生的有效文件指针。
length
必须大于 CVS 文件内最长的一行。在 PHP 5 中该参数是可选的。如果忽略(在 PHP 5.0.4 以后的版本中设为 0)该参数的话,那么长度就没有限制,不过可能会影响执行效率。
delimiter
设置字段分界符(只允许一个字符)。
enclosure
设置字段环绕符(只允许一个字符)。
escape
设置转义字符(只允许一个字符),默认是一个反斜杠。
我想知道enclosure,escape参数怎么用。给个例子。
$s =<<< TXTaaa,bbb,ccc"aaa","bbb","ccc"'aaa'|'bbb'|'ccc'TXT;file_put_contents('csv_test.txt', $s);$fp = fopen('csv_test.txt', 'r');print_r(fgetcsv($fp));print_r(fgetcsv($fp));print_r(fgetcsv($fp, "|", "'"));Array
(
[0] => aaa
[1] => bbb
[2] => ccc
)
Array
(
[0] => aaa
[1] => bbb
[2] => ccc
)
Array
(
[0] =>
[1] => aaa
[2] => |
[3] => bbb
[4] => |
[5] => ccc
[6] =>
)

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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