diff --git a/upload/install/index.php b/upload/install/index.php
index 25dfac110e2ff4e104c09687e27671ed11868936..3ed247c84988731d5427abce99c96f2d0429b978 100644
--- a/upload/install/index.php
+++ b/upload/install/index.php
@@ -321,7 +321,7 @@ if($method == 'show_license') {
 			}
 		}
 
-		if(strpos($tablepre, '.') !== false || intval($tablepre{0})) {
+		if(strpos($tablepre, '.') !== false || intval($tablepre[0])) {
 			show_msg('tablepre_invalid', $tablepre, 0);
 		}
 
diff --git a/upload/source/class/discuz/discuz_database.php b/upload/source/class/discuz/discuz_database.php
index afeb323aba8e2693ea250fd7a301fa3b109622be..4c273ee0cbc6d55e26cca4089b17fb3aeccb016e 100644
--- a/upload/source/class/discuz/discuz_database.php
+++ b/upload/source/class/discuz/discuz_database.php
@@ -307,8 +307,8 @@ class discuz_database {
 		$i = $find = 0;
 		$ret = '';
 		while ($i <= $len && $find < $count) {
-			if ($sql{$i} == '%') {
-				$next = $sql{$i + 1};
+			if ($sql[$i] == '%') {
+				$next = $sql[$i + 1];
 				if ($next == 't') {
 					$ret .= self::table($arg[$find]);
 				} elseif ($next == 's') {
@@ -331,7 +331,7 @@ class discuz_database {
 				$i++;
 				$find++;
 			} else {
-				$ret .= $sql{$i};
+				$ret .= $sql[$i];
 			}
 			$i++;
 		}
diff --git a/upload/source/function/function_admincp.php b/upload/source/function/function_admincp.php
index 8e659ac87d38b080186c930edaa0c693e24c98c9..7551eadf3a6d47f268dbe9dab09b999fb9b1fd7e 100644
--- a/upload/source/function/function_admincp.php
+++ b/upload/source/function/function_admincp.php
@@ -667,7 +667,7 @@ function showsetting($setname, $varname, $value, $type = 'radio', $disabled = ''
 		$s .= '<ul class="nofloat" onmouseover="altStyle(this'.$check['disabledaltstyle'].');">';
 		foreach($varname[1] as $key => $var) {
 			if($var !== false) {
-				$s .= '<li'.($value{$checkboxs - $i} ? ' class="checked"' : '').'><input class="checkbox" type="checkbox"'.($varnameid ? ' id="_v'.md5($i).'_'.$varnameid.'"' : '').' name="'.$varname[0].'['.$i.']" value="1"'.($value{$checkboxs - $i} ? ' checked' : '').' '.(!empty($varname[2][$key]) ? $varname[2][$key] : '').'>&nbsp;'.$var.'</li>';
+				$s .= '<li'.($value[$checkboxs - $i] ? ' class="checked"' : '').'><input class="checkbox" type="checkbox"'.($varnameid ? ' id="_v'.md5($i).'_'.$varnameid.'"' : '').' name="'.$varname[0].'['.$i.']" value="1"'.($value[$checkboxs - $i] ? ' checked' : '').' '.(!empty($varname[2][$key]) ? $varname[2][$key] : '').'>&nbsp;'.$var.'</li>';
 			}
 			$i++;
 		}
@@ -705,7 +705,7 @@ function showsetting($setname, $varname, $value, $type = 'radio', $disabled = ''
 		$css = '';
 		for($i = 0; $i <= 1; $i++) {
 			if($code[$i] != '') {
-				if($code[$i]{0} == '#') {
+				if($code[$i][0] == '#') {
 					$css .= strtoupper($code[$i]).' ';
 				} elseif(preg_match('/^(https?:)?\/\//i', $code[$i])) {
 					$css .= 'url(\''.$code[$i].'\') ';
diff --git a/upload/source/function/function_core.php b/upload/source/function/function_core.php
index fe75e631188b0103ef5a07ea696270628ed71056..05fe24262b26d1ba6b4fa150cd0043bbe046d4e3 100644
--- a/upload/source/function/function_core.php
+++ b/upload/source/function/function_core.php
@@ -381,7 +381,7 @@ function random($length, $numeric = 0) {
 	}
 	$max = strlen($seed) - 1;
 	for($i = 0; $i < $length; $i++) {
-		$hash .= $seed{mt_rand(0, $max)};
+		$hash .= $seed[mt_rand(0, $max)];
 	}
 	return $hash;
 }
@@ -1903,7 +1903,7 @@ function getexpiration() {
 }
 
 function return_bytes($val) {
-	$last = strtolower($val{strlen($val)-1});
+	$last = strtolower($val[strlen($val)-1]);
 	if (!is_numeric($val)) {
 		$val = substr(trim($val), 0, -1);
 	}
@@ -1951,7 +1951,7 @@ function getattachtablebyaid($aid) {
 
 function getattachtableid($tid) {
 	$tid = (string)$tid;
-	return intval($tid{strlen($tid)-1});
+	return intval($tid[strlen($tid)-1]);
 }
 
 function getattachtablebytid($tid) {
diff --git a/upload/source/function/function_misc.php b/upload/source/function/function_misc.php
index 29f7168894cf5b159d28b2e1d0c658fb86ccb4a7..f99a012a4f82acb86cf1fb712cb5ba31ae61c70d 100644
--- a/upload/source/function/function_misc.php
+++ b/upload/source/function/function_misc.php
@@ -60,9 +60,9 @@ function convertip_tiny($ip, $ipdatafile) {
 
 	for ($start = $start['len'] * 8 + 1024; $start < $length; $start += 8) {
 
-		if ($index{$start} . $index{$start + 1} . $index{$start + 2} . $index{$start + 3} >= $ip) {
-			$index_offset = @unpack('Vlen', $index{$start + 4} . $index{$start + 5} . $index{$start + 6} . "\x0");
-			$index_length = @unpack('Clen', $index{$start + 7});
+		if ($index[$start] . $index[$start + 1] . $index[$start + 2] . $index[$start + 3] >= $ip) {
+			$index_offset = @unpack('Vlen', $index[$start + 4] . $index[$start + 5] . $index[$start + 6] . "\x0");
+			$index_length = @unpack('Clen', $index[$start + 7]);
 			break;
 		}
 	}
diff --git a/upload/source/plugin/mobile/mobile.class.php b/upload/source/plugin/mobile/mobile.class.php
index 2ad3a11c80f28b56bf258fa8c87a279e22207609..0331fa7198d500aae3ce6035d9a0ed7c0dbf61f3 100644
--- a/upload/source/plugin/mobile/mobile.class.php
+++ b/upload/source/plugin/mobile/mobile.class.php
@@ -56,7 +56,7 @@ class mobile_core {
 		$return = array();
 		foreach($variables as $key => $value) {
 			foreach($keys as $k) {
-				if($k{0} == '/' && preg_match($k, $key) || $key == $k) {
+				if($k[0] == '/' && preg_match($k, $key) || $key == $k) {
 					if($subkeys) {
 						$return[$key] = mobile_core::getvalues($value, $subkeys);
 					} else {
diff --git a/upload/uc_client/client.php b/upload/uc_client/client.php
index 3ae06fbf934ebd2d3018be273895c4bd3d57fdc5..0f97d1a31e88febebc4e4a94dfbff75ed208fbc2 100644
--- a/upload/uc_client/client.php
+++ b/upload/uc_client/client.php
@@ -143,7 +143,7 @@ function uc_api_mysql($model, $action, $args=array()) {
 		include_once UC_ROOT."./control/$model.php";
 		eval("\$uc_controls['$model'] = new {$model}control();");
 	}
-	if($action{0} != '_') {
+	if($action[0] != '_') {
 		$args = uc_addslashes($args, 1, TRUE);
 		$action = 'on'.$action;
 		$uc_controls[$model]->input = $args;
diff --git a/utility/convert/include/editor.func.php b/utility/convert/include/editor.func.php
index 676ad7d71b8f0a4dbb4e668e6329a9bc97dd397d..6af6f8de361afaaf2d6a23a25898124f89559013 100644
--- a/utility/convert/include/editor.func.php
+++ b/utility/convert/include/editor.func.php
@@ -9,7 +9,7 @@
 
 function absoluteurl($url) {
 	global $_G;
-	if($url{0} == '/') {
+	if($url[0] == '/') {
 		return 'http://'.$_SERVER['HTTP_HOST'].$url;
 	} else {
 		return $_G['siteurl'].$url;
@@ -59,9 +59,9 @@ function divtag($divoptions, $text) {
 function fetchoptionvalue($option, $text) {
 	if(($position = strpos($text, $option)) !== false) {
 		$delimiter = $position + strlen($option);
-		if($text{$delimiter} == '"') {
+		if($text[$delimiter] == '"') {
 			$delimchar = '"';
-		} elseif($text{$delimiter} == '\'') {
+		} elseif($text[$delimiter] == '\'') {
 			$delimchar = '\'';
 		} else {
 			$delimchar = ' ';
@@ -291,7 +291,7 @@ function recursion($tagname, $text, $function, $extraargs = '') {
 		$found = FALSE;
 		$tagnameend = FALSE;
 		for($optionend = $tagbegin; $optionend <= $strlen; $optionend++) {
-			$char = $text{$optionend};
+			$char = $text[$optionend];
 			if(($char == '"' || $char == "'") && $inquote == '') {
 				$inquote = $char;
 			} elseif(($char == '"' || $char == "'") && $inquote == $char) {
diff --git a/utility/convert/source/d7.2_x2.0/table/threadsattachments.php b/utility/convert/source/d7.2_x2.0/table/threadsattachments.php
index f5c60f1940eec536de91ba0066099d6ea0b2831a..dc8e6f3a0b36ecb573d6b8d89a87772856b3c53b 100644
--- a/utility/convert/source/d7.2_x2.0/table/threadsattachments.php
+++ b/utility/convert/source/d7.2_x2.0/table/threadsattachments.php
@@ -38,7 +38,7 @@ while ($row = $db_source->fetch_array($query)) {
 	$row  = daddslashes($row, 1);
 
 	$tid = (string)$row['tid'];
-	$tableid = $tid{strlen($tid)-1};
+	$tableid = $tid[strlen($tid)-1];
 	$table_target_attachment_tableid = $db_target->tablepre.'forum_attachment_'.$tableid;
 	$db_target->query("REPLACE INTO $table_target SET aid='$row[aid]', tid='$row[tid]', pid='$row[pid]', uid='$row[uid]', tableid='$tableid', downloads='$row[downloads]'");
 	$db_target->query("REPLACE INTO $table_target_attachment_tableid SET