Utilisez "n"（用"包裹）并使用"rn"作为记录结束标记。如果单元格输入包含多行，则必须用"entoure les valeurs des cellules.

$fh = fopen('test1.csv', 'w+');
fwrite($fh, "sep=\t" . "\r\n");
fwrite($fh, 'A' ."\t" . 'B' . "\t" . 'C' . "\r\n");
fwrite($fh, 'D' ."\t" . "\"E\nF\nG\"" . "\t" . 'H' . "\r\n");
fclose($fh);

ou (en utilisant des variables)

$varA = 'A';
$varB = 'B';
$varC = 'C';
$varD = 'D';
$varE = 'E';
$varF = 'F';
$varG = 'G';
$varH = 'H';
$fh = fopen('test2.csv', 'w+');
fwrite($fh, "sep=\t"."\r\n");
fwrite($fh, $varA . "\t" . $varB . "\t" . $varC . "\r\n");
fwrite($fh, $varD . "\t" . "\"$varE\n$varF\n$varG\"" . "\t" . $varH . "\r\n");
fclose($fh);

ou (utilisez fputcsv())

$fh = fopen('test3.csv', 'w+');
fwrite($fh, "sep=\t" . "\r\n");
fputcsv($fh, array('A', 'B', 'C'), "\t");
fputcsv($fh, array('D', "E\nF\nG", 'H'), "\t");
fclose($fh);

ou (en utilisant fputcsv() et variables)

$varA = 'A';
$varB = 'B';
$varC = 'C';
$varD = 'D';
$varE = 'E';
$varF = 'F';
$varG = 'G';
$varH = 'H';
$fh = fopen('test4.csv', 'w+');
fwrite($fh, "sep=\t" . "\r\n");
fputcsv($fh, array($varA, $varB, $varC), "\t");
fputcsv($fh, array($varD, "$varE\n$varF\n$varG", $varH), "\t");
fclose($fh);

Essayez ceci

"\n"

Entre guillemets doubles