Revert "Update fputcsv() to escape all characters equally."

On second thoughts, while the behaviour _is_ broken, this isn't the right fix.

This reverts commit 9b5cb0e.

Author: LawnGnome

NEWS

@@ -12,8 +12,6 @@ PHP                                                                        NEWS
 - Core
   . Fixed bug #63943 (Bad warning text from strpos() on empty needle).
     (Laruence)
-  . Fixed bug #43225 (fputcsv incorrectly handles cells ending in \ followed
-    by "). (Adam)
 
 - cURL extension:
   . Fixed bug (segfault due to libcurl connection caching). (Pierrick)

ext/standard/file.c

@@ -1953,6 +1953,7 @@ PHP_FUNCTION(fputcsv)
 {
 	char delimiter = ',';	/* allow this to be set as parameter */
 	char enclosure = '"';	/* allow this to be set as parameter */
+	const char escape_char = '\\';
 	php_stream *stream;
 	int ret;
 	zval *fp = NULL, *fields = NULL, **field_tmp = NULL, field;
@@ -2007,19 +2008,24 @@ PHP_FUNCTION(fputcsv)
 		/* enclose a field that contains a delimiter, an enclosure character, or a newline */
 		if (FPUTCSV_FLD_CHK(delimiter) ||
 			FPUTCSV_FLD_CHK(enclosure) ||
+			FPUTCSV_FLD_CHK(escape_char) ||
 			FPUTCSV_FLD_CHK('\n') ||
 			FPUTCSV_FLD_CHK('\r') ||
 			FPUTCSV_FLD_CHK('\t') ||
-			FPUTCSV_FLD_CHK('\\') ||
 			FPUTCSV_FLD_CHK(' ')
 		) {
 			char *ch = Z_STRVAL(field);
 			char *end = ch + Z_STRLEN(field);
+			int escaped = 0;
 
 			smart_str_appendc(&csvline, enclosure);
 			while (ch < end) {
-				if (*ch == enclosure) {
+				if (*ch == escape_char) {
+					escaped = 1;
+				} else if (!escaped && *ch == enclosure) {
 					smart_str_appendc(&csvline, enclosure);
+				} else {
+					escaped = 0;
 				}
 				smart_str_appendc(&csvline, *ch);
 				ch++;

ext/standard/tests/file/fputcsv.phpt

@@ -44,7 +44,7 @@ echo '$list = ';var_export($res);echo ";\n";
 
 $fp = fopen($file, "r");
 $res = array();
-while($l=fgetcsv($fp, 0, ',', '"', '"'))
+while($l=fgetcsv($fp))
 {
 	$res[] = join(',',$l);
 }
@@ -75,10 +75,10 @@ $list = array (
   13 => 'aaa,"""bbb   """',
   14 => '"aaa""aaa""","""bbb""bbb"',
   15 => '"aaa""aaa""""""",bbb',
-  16 => 'aaa,"""\\""bbb",ccc',
-  17 => '"aaa""\\""a""","""bbb"""',
-  18 => '"""\\""""","""aaa"""',
-  19 => '"""\\""""""",aaa',
+  16 => 'aaa,"""\\"bbb",ccc',
+  17 => '"aaa""\\"a""","""bbb"""',
+  18 => '"""\\"""","""aaa"""',
+  19 => '"""\\"""""",aaa',
 );
 $list = array (
   0 => 'aaa,bbb',