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Try this:

$data = "שם פרטי,שם משפחה,עיר\na,b,c\n1,2,3"; // need to use " for \n
file_put_contents("myexcel.csv","\xEF\xBB\xBF"); // BOM with UTF-8 to csv
file_put_contents("myexcel.csv",$data,FILE_APPEND); // add more data

Hope it helps.

Try this alternative saving as CSV:

$data = "שם פרטי,שם משפחה,עיר\na,b,c\n1,2,3"; // need to use " for \n
file_put_contents("myexcel.csv","\xEF\xBB\xBF"); // BOM with UTF-8 to csv
file_put_contents("myexcel.csv",$data,FILE_APPEND); // add more data

Hope it helps.