Remove some unnecessary function_exists() checks and some minor improvements

5 files changed, 16 insertions, 26 deletions

diff --git a/system/core/Output.php b/system/core/Output.php
index 0bf982289..5588ffe8e 100755
--- a/system/core/Output.php
+++ b/system/core/Output.php
@@ -370,7 +370,7 @@ class CI_Output {
 
 		if ($this->parse_exec_vars === TRUE)
 		{
-			$memory	= function_exists('memory_get_usage') ? round(memory_get_usage()/1024/1024, 2).'MB' : '0';
+			$memory	= round(memory_get_usage() / 1024 / 1024, 2).'MB';
 
 			$output = str_replace(array('{elapsed_time}', '{memory_usage}'), array($elapsed, $memory), $output);
 		}
diff --git a/system/helpers/path_helper.php b/system/helpers/path_helper.php
index 13410545c..fec4a1a10 100644
--- a/system/helpers/path_helper.php
+++ b/system/helpers/path_helper.php
@@ -55,7 +55,7 @@ if ( ! function_exists('set_realpath'))
 		}
 
 		// Resolve the path
-		if (function_exists('realpath') && @realpath($path) !== FALSE)
+		if (@realpath($path) !== FALSE)
 		{
 			$path = realpath($path);
 		}
diff --git a/system/libraries/Profiler.php b/system/libraries/Profiler.php
index aaac0c518..d96088c14 100644
--- a/system/libraries/Profiler.php
+++ b/system/libraries/Profiler.php
@@ -402,7 +402,7 @@ class CI_Profiler {
 			."\n"
 			.'<legend style="color:#5a0099;">&nbsp;&nbsp;'.$this->CI->lang->line('profiler_memory_usage')."&nbsp;&nbsp;</legend>\n"
 			.'<div style="color:#5a0099;font-weight:normal;padding:4px 0 4px 0;">'
-			.((function_exists('memory_get_usage') && ($usage = memory_get_usage()) !== '') ? number_format($usage).' bytes' : $this->CI->lang->line('profiler_no_memory'))
+			.(($usage = memory_get_usage()) != '' ? number_format($usage).' bytes' : $this->CI->lang->line('profiler_no_memory'))
 			.'</div></fieldset>';
 	}
 
diff --git a/system/libraries/Unit_test.php b/system/libraries/Unit_test.php
index a87cf7e14..70ad8dc41 100644
--- a/system/libraries/Unit_test.php
+++ b/system/libraries/Unit_test.php
@@ -124,7 +124,7 @@ class CI_Unit_test {
 
 		$this->results[] = $report;
 
-		return($this->report($this->result($report)));
+		return $this->report($this->result($report));
 	}
 
 	// --------------------------------------------------------------------
@@ -289,15 +289,11 @@ class CI_Unit_test {
 	 */
 	protected function _backtrace()
 	{
-		if (function_exists('debug_backtrace'))
-		{
-			$back = debug_backtrace();
-			return array(
-					'file' => (isset($back[1]['file']) ? $back[1]['file'] : ''),
-					'line' => (isset($back[1]['line']) ? $back[1]['line'] : '')
-				);
-		}
-		return array('file' => 'Unknown', 'line' => 'Unknown');
+		$back = debug_backtrace();
+		return array(
+				'file' => (isset($back[1]['file']) ? $back[1]['file'] : ''),
+				'line' => (isset($back[1]['line']) ? $back[1]['line'] : '')
+			);
 	}
 
 	// --------------------------------------------------------------------
diff --git a/system/libraries/Upload.php b/system/libraries/Upload.php
index c1e07de7a..1f6aeeb6b 100644
--- a/system/libraries/Upload.php
+++ b/system/libraries/Upload.php
@@ -694,7 +694,7 @@ class CI_Upload {
 			return FALSE;
 		}
 
-		if (function_exists('realpath') && @realpath($this->upload_path) !== FALSE)
+		if (@realpath($this->upload_path) !== FALSE)
 		{
 			$this->upload_path = str_replace('\\', '/', realpath($this->upload_path));
 		}
@@ -815,17 +815,17 @@ class CI_Upload {
 			return FALSE;
 		}
 
-		if (function_exists('memory_get_usage') && memory_get_usage() && ini_get('memory_limit'))
+		if (memory_get_usage() && ($memory_limit = ini_get('memory_limit')))
 		{
-			$current = ini_get('memory_limit') * 1024 * 1024;
+			$memory_limit *= 1024 * 1024;
 
 			// There was a bug/behavioural change in PHP 5.2, where numbers over one million get output
 			// into scientific notation. number_format() ensures this number is an integer
 			// http://bugs.php.net/bug.php?id=43053
 
-			$new_memory = number_format(ceil(filesize($file) + $current), 0, '.', '');
+			$memory_limit = number_format(ceil(filesize($file) + $memory_limit), 0, '.', '');
 
-			ini_set('memory_limit', $new_memory); // When an integer is used, the value is measured in bytes. - PHP.net
+			ini_set('memory_limit', $memory_limit); // When an integer is used, the value is measured in bytes. - PHP.net
 		}
 
 		// If the file being uploaded is an image, then we should have no problem with XSS attacks (in theory), but
@@ -849,14 +849,8 @@ class CI_Upload {
 			// <a, <body, <head, <html, <img, <plaintext, <pre, <script, <table, <title
 			// title is basically just in SVG, but we filter it anyhow
 
-			if ( ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes))
-			{
-				return TRUE; // its an image, no "triggers" detected in the first 256 bytes, we're good
-			}
-			else
-			{
-				return FALSE;
-			}
+			// if its an image or no "triggers" detected in the first 256 bytes - we're good
+			return ! preg_match('/<(a|body|head|html|img|plaintext|pre|script|table|title)[\s>]/i', $opening_bytes);
 		}
 
 		if (($data = @file_get_contents($file)) === FALSE)