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Код


$titles = mysql_query("SELECT title FROM dle_wikip");
$i = 1;
$titlearray = array();
while($row = $db->mysql_fetch_array($titles)){
    $titlearray[$i] = $row[0];
    $i++;
}

$text = 'Welcome! Use uhh hjgk gikjhgu klug or somethink [[Else|ElSe]]. [[Welcome_page_24|Kampai!]]!!!';

$text = preg_replace( "#\[\[(.+?)\|(.+?)\]\]#is"  , linker("\\1", "\\2"), $text );


function linker($lnk, $alt){
global $titlearray;
    if(in_array("{$lnk}", $titlearray)){
        return '<a href="'.$lnk.'">'.$alt.'</a>';
    }
    else{
        return '<a href="'.$lnk.'" style="color:#ff0000;">'.$alt.'</a>';
    }
}

echo $text;

Код


Array
(
    [1] => Welcome_page_1
    [2] => Welcome_page_2
    [3] => Welcome_page_3
    [4] => Welcome_page_4
    [5] => Welcome_page_5
    [6] => Welcome_page_6
    [7] => Welcome_page_7
    [8] => Welcome_page_8
    [9] => Welcome_page_9
    [10] => Welcome_page_10
    [11] => Welcome_page_11
    [12] => Welcome_page_12
    [13] => Welcome_page_13
    [14] => Welcome_page_14
    [15] => Welcome_page_15
    [16] => Welcome_page_16
    [17] => Welcome_page_17
    [18] => Welcome_page_18
    [19] => Welcome_page_19
    [20] => Welcome_page_20
    [21] => Welcome_page_21
    [22] => Welcome_page_22
    [23] => Welcome_page_23
    [24] => Welcome_page_24
    [25] => Welcome_page_25
    [26] => Welcome_page_26
    [27] => Welcome_page_27
    [28] => Welcome_page_28
    [29] => Welcome_page_29
    [30] => Welcome_page_30
    [31] => Welcome_page_31
    [32] => Welcome_page_32
    [33] => Welcome_page_33
    [34] => Welcome_page_34
    [35] => Welcome_page_35
    [36] => Welcome_page_36
    [37] => Welcome_page_37
    [38] => Welcome_page_38
    [39] => Welcome_page_39
    [40] => Welcome_page_40
    [41] => Welcome_page_41
    [42] => Welcome_page_42
    [43] => Welcome_page_43
    [44] => Welcome_page_44
    [45] => Welcome_page_45
    [46] => Welcome_page_46
    [47] => Welcome_page_47
    [48] => Welcome_page_48
    [49] => Welcome_page_49
    [50] => Welcome_page_50
    [51] => Welcome_page_51
    [52] => Welcome_page_52
    [53] => Welcome_page_53
    [54] => Welcome_page_54
    [55] => Welcome_page_55
    [56] => Welcome_page_56
    [57] => Welcome_page_57
    [58] => Welcome_page_58
    [59] => Welcome_page_59
    [60] => Welcome_page_60
    [61] => Welcome_page_61
    [62] => Welcome_page_62
    [63] => Welcome_page_63
    [64] => Welcome_page_64
    [65] => Welcome_page_65
    [66] => Welcome_page_66
    [67] => Welcome_page_67
    [68] => Welcome_page_68
    [69] => Welcome_page_69
    [70] => Welcome_page_70
    [71] => Welcome_page_71
    [72] => Welcome_page_72
    [73] => Welcome_page_73
    [74] => Welcome_page_74
    [75] => Welcome_page_75
    [76] => Welcome_page_76
    [77] => Welcome_page_77
    [78] => Welcome_page_78
    [79] => Welcome_page_79
    [80] => Welcome_page_80
    [81] => Welcome_page_81
    [82] => Welcome_page_82
    [83] => Welcome_page_83
    [84] => Welcome_page_84
    [85] => Welcome_page_85
    [86] => Welcome_page_86
    [87] => Welcome_page_87
    [88] => Welcome_page_88
    [89] => Welcome_page_89
    [90] => Welcome_page_90
    [91] => Welcome_page_91
    [92] => Welcome_page_92
    [93] => Welcome_page_93
    [94] => Welcome_page_94
    [95] => Welcome_page_95
    [96] => Welcome_page_96
    [97] => Welcome_page_97
    [98] => Welcome_page_98
    [99] => Welcome_page_99
    [100] => Welcome_page_100
)