问PHP:某些时间/日期值没有被标记为冲突(但大多数其他值是冲突)

EN

//new (proposed) session conflicts checker
function checkStartFirst($cf_presX, $cf_presY) {                         
    //$cf_presX['fullStart'] < $cf_presY['fullStart'] ? $this->isConflict($cf_presX, $cf_presY) : $this->isConflict($cf_presY, $cf_presX);

    echo 'Received for checking: '. $cf_presX['id'] . '  /  ' . $cf_presY['id'] .'<br>';
    if($cf_presX['fullStart'] < $cf_presY['fullStart']){
        echo 'A: ';
        $this->isConflict($cf_presX, $cf_presY);        
    }else{
        echo 'B: ';
        $this->isConflict($cf_presY, $cf_presX);        
    }   
}

function isConflict ($cc_presX, $cc_presY) {      
    echo 'CHECKING:  ' . $cc_presX['id'] .' [end: ' . $cc_presX['fullEnd'] . ']     >     ' . $cc_presY['id'] .'  [start: ' . $cc_presY['fullStart'] . ']';
    if ($cc_presX['fullEnd'] > $cc_presY['fullStart']) {    
        echo '  --   has conflict <br>';            
        array_push($this->conflict_output, $cc_presX['id']);
        array_push($this->conflict_output, $cc_presY['id']);
        //echo 'Found Conflict: ' . $cc_presX['id'] . '  /  ' . $cc_presY['id'] . '<br>';
    }else{
        //only here for debugging readability
        echo '<br>';
    }
}

function setConflicts() {
    $presentations = $this->conflict_list;  
    for ($i = 0; $i < count($presentations); $i++) {
        for ($j = 0; $j < count($presentations); $j++) {
            // if it is not the same event
            if ($presentations[$i]['id'] != $presentations[$j]['id']) {
                echo '<br><br>Sending: '.($presentations[$i]['id'] .'  /  '. $presentations[$j]['id']) .'<br>';
                $this->checkStartFirst($presentations[$i], $presentations[$j]);
            }else{
                echo '<br><br><br>same session, do not check: ' . ($presentations[$i]['id'] .'  /  '. $presentations[$j]['id']) . '<br><br><br>';
            }
        }
    } 
    $this->getConflicts();  
}

function getConflicts(){
    $presentations = $this->conflict_output;
    //remove duplicates in array & re-key (sequentially)
    $uniquePresentations = array_unique($presentations);
    //re-key array using sequential index #'s
    $uniquePresentations = array_values($uniquePresentations);
    if(count($uniquePresentations) > 0){
        //save conflict (names) to array
        $this->conflict_return = $uniquePresentations;
        $this->errmsg = 'Please review the form for errors, there are conflicts in the highlighted sessions below. (Possible duplicate or overlapping session times have been selected.) <br>You can not proceed until all conflicts are resolved.';    
    }       
}