--- /dev/null
+<?php
+$before = "ABC\\ABC";
+$expect = "ABC\\\\ABC";
+$after = pg_escape_string($before);
+if ($expect === $after) {
+ echo "pg_escpae_string() is Ok\n";
+}
+else {
+ echo "pg_escpae_string() is NOT Ok\n";
+ var_dump($before);
+ var_dump($after);
+ var_dump($expect);
+}
+
+$before = "ABC\\ABC";
+$expect = "ABC\\\\\\\\ABC";
+$after = pg_escape_bytea($before);
+if ($expect === $after) {
+ echo "pg_escpae_byte() is Ok\n";
+}
+else {
+ echo "pg_escpae_byte() is NOT Ok\n";
+ var_dump($before);
+ var_dump($after);
+ var_dump($expect);
+}
+
+?>
\ No newline at end of file