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1 | <?php |
2 | |
3 | /** |
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4 | * global.php |
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5 | * |
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6 | * Copyright (c) 1999-2003 The SquirrelMail Project Team |
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7 | * Licensed under the GNU GPL. For full terms see the file COPYING. |
8 | * |
9 | * This includes code to update < 4.1.0 globals to the newer format |
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10 | * It also has some session register functions that work across various |
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11 | * php versions. |
12 | * |
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13 | * $Id$ |
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14 | * @package squirrelmail |
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15 | */ |
16 | |
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17 | /** Bring in the config file. */ |
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18 | require_once(SM_PATH . 'config/config.php'); |
19 | |
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20 | /** set the name of the session cookie */ |
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21 | if(isset($session_name) && $session_name) { |
22 | ini_set('session.name' , $session_name); |
23 | } else { |
24 | ini_set('session.name' , 'SQMSESSID'); |
25 | } |
26 | |
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27 | /** If magic_quotes_runtime is on, SquirrelMail breaks in new and creative ways. |
28 | * Force magic_quotes_runtime off. |
29 | * tassium@squirrelmail.org - I put it here in the hopes that all SM code includes this. |
30 | * If there's a better place, please let me know. |
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31 | */ |
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32 | ini_set('magic_quotes_runtime','0'); |
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33 | |
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34 | /* Since we decided all IMAP servers must implement the UID command as defined in |
35 | * the IMAP RFC, we force $uid_support to be on. |
36 | */ |
37 | |
38 | global $uid_support; |
39 | $uid_support = true; |
40 | |
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41 | sqsession_is_active(); |
42 | |
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43 | /* convert old-style superglobals to current method |
44 | * this is executed if you are running PHP 4.0.x. |
45 | * it is run via a require_once directive in validate.php |
46 | * and redirect.php. Patch submitted by Ray Black. |
47 | */ |
48 | |
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49 | if ( !check_php_version(4,1) ) { |
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50 | global $_COOKIE, $_ENV, $_FILES, $_GET, $_POST, $_SERVER, $_SESSION; |
51 | global $HTTP_COOKIE_VARS, $HTTP_ENV_VARS, $HTTP_POST_FILES, $HTTP_GET_VARS, |
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52 | $HTTP_POST_VARS, $HTTP_SERVER_VARS, $HTTP_SESSION_VARS, $PHP_SELF; |
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53 | $_COOKIE =& $HTTP_COOKIE_VARS; |
54 | $_ENV =& $HTTP_ENV_VARS; |
55 | $_FILES =& $HTTP_POST_FILES; |
56 | $_GET =& $HTTP_GET_VARS; |
57 | $_POST =& $HTTP_POST_VARS; |
58 | $_SERVER =& $HTTP_SERVER_VARS; |
59 | $_SESSION =& $HTTP_SESSION_VARS; |
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60 | if (!isset($PHP_SELF) || empty($PHP_SELF)) { |
61 | $PHP_SELF = $HTTP_SERVER_VARS['PHP_SELF']; |
62 | } |
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63 | } |
64 | |
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65 | /* if running with magic_quotes_gpc then strip the slashes |
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66 | from POST and GET global arrays */ |
67 | |
68 | if (get_magic_quotes_gpc()) { |
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69 | sqstripslashes($_GET); |
70 | sqstripslashes($_POST); |
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71 | } |
72 | |
73 | /* strip any tags added to the url from PHP_SELF. |
74 | This fixes hand crafted url XXS expoits for any |
75 | page that uses PHP_SELF as the FORM action */ |
76 | |
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77 | $_SERVER['PHP_SELF'] = strip_tags($_SERVER['PHP_SELF']); |
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78 | |
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79 | /** |
80 | * returns true if current php version is at mimimum a.b.c |
81 | * |
82 | * Called: check_php_version(4,1) |
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83 | * @param int a major version number |
84 | * @param int b minor version number |
85 | * @param int c release number |
86 | * @return bool |
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87 | */ |
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88 | function check_php_version ($a = '0', $b = '0', $c = '0') |
89 | { |
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90 | global $SQ_PHP_VERSION; |
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91 | |
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92 | if(!isset($SQ_PHP_VERSION)) |
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93 | $SQ_PHP_VERSION = substr( str_pad( preg_replace('/\D/','', PHP_VERSION), 3, '0'), 0, 3); |
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94 | |
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95 | return $SQ_PHP_VERSION >= ($a.$b.$c); |
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96 | } |
97 | |
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98 | /** |
99 | * returns true if the current internal SM version is at minimum a.b.c |
100 | * These are plain integer comparisons, as our internal version is |
101 | * constructed by us, as an array of 3 ints. |
102 | * |
103 | * Called: check_sm_version(1,3,3) |
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104 | * @param int a major version number |
105 | * @param int b minor version number |
106 | * @param int c release number |
107 | * @return bool |
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108 | */ |
109 | function check_sm_version($a = 0, $b = 0, $c = 0) |
110 | { |
111 | global $SQM_INTERNAL_VERSION; |
112 | if ( !isset($SQM_INTERNAL_VERSION) || |
113 | $SQM_INTERNAL_VERSION[0] < $a || |
114 | $SQM_INTERNAL_VERSION[1] < $b || |
115 | ( $SQM_INTERNAL_VERSION[1] == $b && |
116 | $SQM_INTERNAL_VERSION[2] < $c ) ) { |
117 | return FALSE; |
118 | } |
119 | return TRUE; |
120 | } |
121 | |
122 | |
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123 | /** |
124 | * Recursively strip slashes from the values of an array. |
125 | * @param array array the array to strip, passed by reference |
126 | * @return void |
127 | */ |
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128 | function sqstripslashes(&$array) { |
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129 | if(count($array) > 0) { |
130 | foreach ($array as $index=>$value) { |
131 | if (is_array($array[$index])) { |
132 | sqstripslashes($array[$index]); |
133 | } |
134 | else { |
135 | $array[$index] = stripslashes($value); |
136 | } |
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137 | } |
138 | } |
139 | } |
140 | |
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141 | /** |
142 | * Add a variable to the session. |
143 | * @param mixed $var the variable to register |
144 | * @param string $name the name to refer to this variable |
145 | * @return void |
146 | */ |
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147 | function sqsession_register ($var, $name) { |
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148 | |
149 | sqsession_is_active(); |
150 | |
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151 | if ( !check_php_version(4,1) ) { |
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152 | global $HTTP_SESSION_VARS; |
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153 | $HTTP_SESSION_VARS[$name] = $var; |
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154 | } |
155 | else { |
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156 | $_SESSION["$name"] = $var; |
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157 | } |
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158 | session_register("$name"); |
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159 | } |
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160 | |
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161 | /** |
162 | * Delete a variable from the session. |
163 | * @param string $name the name of the var to delete |
164 | * @return void |
165 | */ |
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166 | function sqsession_unregister ($name) { |
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167 | |
168 | sqsession_is_active(); |
169 | |
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170 | if ( !check_php_version(4,1) ) { |
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171 | global $HTTP_SESSION_VARS; |
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172 | unset($HTTP_SESSION_VARS[$name]); |
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173 | } |
174 | else { |
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175 | unset($_SESSION[$name]); |
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176 | } |
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177 | session_unregister("$name"); |
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178 | } |
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179 | |
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180 | /** |
181 | * Checks to see if a variable has already been registered |
182 | * in the session. |
183 | * @param string $name the name of the var to check |
184 | * @return bool whether the var has been registered |
185 | */ |
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186 | function sqsession_is_registered ($name) { |
187 | $test_name = &$name; |
188 | $result = false; |
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189 | if ( !check_php_version(4,1) ) { |
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190 | global $HTTP_SESSION_VARS; |
191 | if (isset($HTTP_SESSION_VARS[$test_name])) { |
192 | $result = true; |
193 | } |
194 | } |
195 | else { |
196 | if (isset($_SESSION[$test_name])) { |
197 | $result = true; |
198 | } |
199 | } |
200 | return $result; |
201 | } |
202 | |
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203 | |
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204 | define('SQ_INORDER',0); |
205 | define('SQ_GET',1); |
206 | define('SQ_POST',2); |
207 | define('SQ_SESSION',3); |
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208 | define('SQ_COOKIE',4); |
209 | define('SQ_SERVER',5); |
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210 | define('SQ_FORM',6); |
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211 | |
212 | /** |
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213 | * Search for the var $name in $_SESSION, $_POST, $_GET, |
214 | * $_COOKIE, or $_SERVER and set it in provided var. |
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215 | * |
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216 | * If $search is not provided, or == SQ_INORDER, it will search |
217 | * $_SESSION, then $_POST, then $_GET. Otherwise, |
218 | * use one of the defined constants to look for |
219 | * a var in one place specifically. |
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220 | * |
221 | * Note: $search is an int value equal to one of the |
222 | * constants defined above. |
223 | * |
224 | * example: |
225 | * sqgetGlobalVar('username',$username,SQ_SESSION); |
226 | * -- no quotes around last param! |
227 | * |
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228 | * @param string name the name of the var to search |
229 | * @param mixed value the variable to return |
230 | * @param int search constant defining where to look |
231 | * @return bool whether variable is found. |
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232 | */ |
233 | function sqgetGlobalVar($name, &$value, $search = SQ_INORDER) { |
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234 | |
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235 | if ( !check_php_version(4,1) ) { |
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236 | global $HTTP_COOKIE_VARS, $HTTP_GET_VARS, $HTTP_POST_VARS, |
237 | $HTTP_SERVER_VARS, $HTTP_SESSION_VARS; |
238 | |
239 | $_COOKIE =& $HTTP_COOKIE_VARS; |
240 | $_GET =& $HTTP_GET_VARS; |
241 | $_POST =& $HTTP_POST_VARS; |
242 | $_SERVER =& $HTTP_SERVER_VARS; |
243 | $_SESSION =& $HTTP_SESSION_VARS; |
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244 | } |
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245 | |
246 | /* NOTE: DO NOT enclose the constants in the switch |
247 | statement with quotes. They are constant values, |
248 | enclosing them in quotes will cause them to evaluate |
249 | as strings. */ |
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250 | switch ($search) { |
251 | /* we want the default case to be first here, |
252 | so that if a valid value isn't specified, |
253 | all three arrays will be searched. */ |
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254 | default: |
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255 | case SQ_INORDER: // check session, post, get |
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256 | case SQ_SESSION: |
257 | if( isset($_SESSION[$name]) ) { |
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258 | $value = $_SESSION[$name]; |
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259 | return TRUE; |
260 | } elseif ( $search == SQ_SESSION ) { |
261 | break; |
262 | } |
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263 | case SQ_FORM: // check post, get |
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264 | case SQ_POST: |
265 | if( isset($_POST[$name]) ) { |
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266 | $value = $_POST[$name]; |
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267 | return TRUE; |
268 | } elseif ( $search == SQ_POST ) { |
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269 | break; |
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270 | } |
271 | case SQ_GET: |
272 | if ( isset($_GET[$name]) ) { |
273 | $value = $_GET[$name]; |
274 | return TRUE; |
275 | } |
276 | /* NO IF HERE. FOR SQ_INORDER CASE, EXIT after GET */ |
277 | break; |
278 | case SQ_COOKIE: |
279 | if ( isset($_COOKIE[$name]) ) { |
280 | $value = $_COOKIE[$name]; |
281 | return TRUE; |
282 | } |
283 | break; |
284 | case SQ_SERVER: |
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285 | if ( isset($_SERVER[$name]) ) { |
286 | $value = $_SERVER[$name]; |
287 | return TRUE; |
288 | } |
289 | break; |
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290 | } |
291 | return FALSE; |
292 | } |
293 | |
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294 | /** |
295 | * Deletes an existing session, more advanced than the standard PHP |
296 | * session_destroy(), it explicitly deletes the cookies and global vars. |
297 | */ |
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298 | function sqsession_destroy() { |
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299 | |
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300 | /* |
301 | * php.net says we can kill the cookie by setting just the name: |
302 | * http://www.php.net/manual/en/function.setcookie.php |
303 | * maybe this will help fix the session merging again. |
304 | * |
305 | * Changed the theory on this to kill the cookies first starting |
306 | * a new session will provide a new session for all instances of |
307 | * the browser, we don't want that, as that is what is causing the |
308 | * merging of sessions. |
309 | */ |
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310 | |
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311 | global $base_uri; |
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312 | |
313 | if (isset($_COOKIE[session_name()])) setcookie(session_name(), '', time() - 5, $base_uri); |
314 | if (isset($_COOKIE['username'])) setcookie('username','',time() - 5,$base_uri); |
315 | if (isset($_COOKIE['key'])) setcookie('key','',time() - 5,$base_uri); |
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316 | |
317 | $sessid = session_id(); |
318 | if (!empty( $sessid )) { |
319 | if ( !check_php_version(4,1) ) { |
320 | global $HTTP_SESSION_VARS; |
321 | $HTTP_SESSION_VARS = array(); |
322 | } else { |
323 | $_SESSION = array(); |
324 | } |
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325 | @session_destroy(); |
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326 | } |
327 | |
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328 | } |
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329 | |
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330 | /** |
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331 | * Function to verify a session has been started. If it hasn't |
332 | * start a session up. php.net doesn't tell you that $_SESSION |
333 | * (even though autoglobal), is not created unless a session is |
334 | * started, unlike $_POST, $_GET and such |
335 | */ |
336 | |
337 | function sqsession_is_active() { |
338 | |
339 | $sessid = session_id(); |
340 | if ( empty( $sessid ) ) { |
341 | session_start(); |
342 | } |
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343 | } |
344 | |
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345 | |
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346 | ?> |