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SplFileObject::fgetcsv

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplFileObject::fgetcsv — Gets line from file and parse as CSV fields

说明

public SplFileObject::fgetcsv(string $separator = ",", string $enclosure = "\"", string $escape = "\\"): array|false

Gets a line from the file which is in CSV format and returns an array containing the fields read.

注意:

此函数会考虑区域设置。例如，如果 LC_CTYPE 为 en_US.UTF-8，可能会错误的解析某些单字节编码的数据。

参数

separator

The field delimiter (one single-byte character only). By default , or the value set by a prior call to SplFileObject::setCsvControl().

enclosure

The field enclosure character (one single-byte character only). By default " or the value set by a prior call to SplFileObject::setCsvControl().

escape

The escape character (at most one single-byte character). By default \ or the value set by a prior call to SplFileObject::setCsvControl(). An empty string ("") disables the proprietary escape mechanism.

警告

在输入流中，enclosure 字符在引号字符串内可通过重复自身进行转义，解析后结果中将只保留一个 enclosure 字符。而 escape 字符的行为有所不同：若输入中出现 escape 字符与 enclosure 字符的组合序列，这两个字符都会保留在解析结果中。因此，在默认参数下，类似 "a""b","c\"d" 的 CSV 行将被解析为两个字段，分别为 a"b 和 c\"d。

警告

As of PHP 8.4.0, depending on the default value of escape is deprecated. It needs to be provided explicitly either positionally or by the use of Named Arguments, or by a call to SplFileObject::setCsvControl().

警告

当 escape 被设置为非空字符串（""）时， 可能导致生成的 CSV 不符合 » RFC 4180 的要求， 或者无法通过 PHP CSV 函数的往返处理。 escape 的默认值是 "\\"，因此建议显式地将其设置为空字符串。 默认值将在未来的 PHP 版本中更改，不早于 PHP 9.0。

返回值

Returns an indexed array containing the fields read, or false on error.

注意:

A blank line in a CSV file will be returned as an array comprising a single null field unless using SplFileObject::SKIP_EMPTY | SplFileObject::DROP_NEW_LINE, in which case empty lines are skipped.

错误／异常

如果 separator 或者 enclosure 长度不是一个字节，则抛出 ValueError。

如果 escape 的长度不是一个字节或者为空字符串，则抛出 ValueError。

更新日志

版本 说明
8.4.0 现在已弃用依赖 escape 的默认值。
7.4.0 The escape parameter now also accepts an empty string to disable the proprietary escape mechanism.

示例

示例 #1 SplFileObject::fgetcsv() example

<?php
$file = new SplFileObject("data.csv");
while (!$file->eof()) {
var_dump($file->fgetcsv());
}
?>

示例 #2 SplFileObject::READ_CSV example

<?php
$file = new SplFileObject("animals.csv");
$file->setFlags(SplFileObject::READ_CSV);
foreach ($file as $row) {
list($animal, $class, $legs) = $row;
printf("A %s is a %s with %d legs\n", $animal, $class, $legs);
}
?>

Contents of animals.csv

crocodile,reptile,4
dolphin,mammal,0
duck,bird,2
koala,mammal,4
salmon,fish,0

以上示例的输出类似于：

A crocodile is a reptile with 4 legs
A dolphin is a mammal with 0 legs
A duck is a bird with 2 legs
A koala is a mammal with 4 legs
A salmon is a fish with 0 legs

参见