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Example of what happens when a file like www.domain.com/wrong_file.pdf is called using default class.tslib_fe.php :
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NB: there variables listed either side of functions show the vlaues of these variables before & after these functions.
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Where the functions are indented further than the preceding function this is due to that function being called inside the previous named function.
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in /typo3/sysext/cms/tslib/
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$TSFE->checkAlternativeIdMethods() // called from index_ts.php # Since the 'TYPO3_SITE_SCRIPT' is not a valid typo3 SSD page. /*.html
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$TSFE->determineId() // called from index_ts.php
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$this->id = ''
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$this->setIDfromArgV() // class.tslib_fe.php # $this->id must be 'false' in order for any processing to happen in here, BUT sinve there is no alias $this->id is set to 0
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$this->id = 0
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$this->id = 0
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$this->fetch_the_id() // class.tslib_fe.php # Get The Page ID
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$this->id = 0
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$this->id = 0
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$this->checkAndSetAlias() // class.tslib_fe.php # Fetches the integer page id for a page alias.
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$this->id = 0
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$this->pageNotFound = 0
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$this->id = 0
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$this->findDomainRecord() // class.tslib_fe.php # Looking up a domain record based on HTTP_HOST
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$this->id = 0
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since $this->id = 0 , the next code block starting with the following is executed.
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if (!$this->id) { // from about line 861 in TYPO3v4.1.6
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***** after the code block that follows this if statement $this->id = 1
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***** this is why i suggested to replace the above if statement with this line of code, which stops the processing of $this->id when $this->id=0
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***** if (!$this->id && (t3lib_div::getIndpEnv('TYPO3_SITE_SCRIPT')=='index.php' || !(t3lib_div::getIndpEnv('TYPO3_SITE_SCRIPT') && $this->TYPO3_CONF_VARS['FE']['pageNotFound_handling']))) {
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$this->id = 1
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$this->getPageAndRootlineWithDomain() // class.tslib_fe.php # Gets ->page and ->rootline information based on ->id. ->id may change during this operation.
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$this->id = 1
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$this->getPageAndRootline() // class.tslib_fe.php # Gets the page and rootline arrays based on the id, $this->id
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$this->id = 1
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// inside this function if $this->id still equals 0 after $this->sys_page->getPage(), and if $this->TYPO3_CONF_VARS['FE']['pageNotFound_handling'] is true then $this->pageNotFoundAndExit() is called
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$this->pageNotFound = 0
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$this->id = 1
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$this->sys_page->getPage() // class.t3lib_page.php # If no page is found an empty array is returned.
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$this->id = 1
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// inside this function; if $this->id starts with a value of 0, then no page is found and an empty array is returned to function getPageAndRootline()
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$TSFE->getConfigArray(); // called from index_ts.php
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