关于fgetcsv函数
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
[解决办法]

$s =<<< TXT
aaa,bbb,ccc
"aaa","bbb","ccc"
'aaa'
[解决办法]
'bbb'
[解决办法]
'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, "
[解决办法]
", "'"));

Array
(
[0] => aaa
[1] => bbb
[2] => ccc
)
Array
(
[0] => aaa
[1] => bbb
[2] => ccc
)
Array
(
[0] =>
[1] => aaa
[2] =>
[解决办法]

[3] => bbb
[4] =>
[解决办法]

[5] => ccc
[6] =>
)