Fix PHP deprecated warning

adodb-active-record.inc.php. / ADODB_Active_Record::Update() throws
"strcmp(): Passing null to parameter 1 ($string1) of type string is
deprecated" when setting a column to null.

Apply the same code change to adodb-active-recordx.inc.php.

Fixes #1021

1 files changed, 3 insertions, 3 deletions

diff --git a/adodb-active-recordx.inc.php b/adodb-active-recordx.inc.php
index 5de5b130..cee95c66 100644
--- a/adodb-active-recordx.inc.php
+++ b/adodb-active-recordx.inc.php
@@ -1142,10 +1142,10 @@ class ADODB_Active_Record {
 		$valarr = array();
 		$neworig = array();
 		$pairs = array();
-		$i = -1;
+		$i = 0;
 		$cnt = 0;
 		foreach($table->flds as $name=>$fld) {
-			$i += 1;
+			$orig = $this->_original[$i++] ?? null;
 			$val = $this->$name;
 			$neworig[] = $val;
 
@@ -1165,7 +1165,7 @@ class ADODB_Active_Record {
 				}
 			}
 
-			if (isset($this->_original[$i]) && $val === $this->_original[$i]) {
+			if ($val === $orig) {
 				continue;
 			}
 			$valarr[] = $val;