flettitakkar.php

<?php
/*
function flettitakkar($num_of_things, $page, $slod, $max_per_page = 30)
Skilar flettitökkum í streng sem html kóða.
$num_of_things er fjöldi hluta
$page er númer síðunnar sem verið er að birta (0,1,2,3 ...)
Viljum sækja GET gildið page með php kóða en ef það klikkar þá látum við page gildið vera 0, dæmi:
    
if(filter_has_var(INPUT_GET, "page") !== false && filter_input(INPUT_GET, 'page', FILTER_VALIDATE_INT) !== false) {
    $page = filter_input(INPUT_GET, "page", FILTER_SANITIZE_NUMBER_INT);
    if($page <= 0) {
        $page = 0;
    }
}
else {
    $page = 0;
}
    
$slod er nafnið á skjalinu sem verið er að nota formúluna í, t.d. "name.php?" eða "name.php?v=oHg5SJYRHA0&" ATH! muna eftir '?' eða '&' aftast
$max_per_page ákvarðar fjölda hluta á hverja síðu, default er 30
*/
function flettitakkar($num_of_things, $page, $slod, $max_per_page = 30) {
    $pages = ceil($num_of_things/$max_per_page - 1);
    if($page < 0 || $page > $pages) {
        $page = 0;
    }
    $sam = "page=";
    
    $t0 = 0;
    $t1 = 1;
    $t2 = 2;
    $t3 = 3;
    $t4 = 4;
    
    if($page == 0) {
        $fyrri = "&lt;&lt; Fyrri";
    }
    else {
        $back = $page - 1;
        $fyrri = "<a href='$slod$sam$back'>&lt;&lt; Fyrri</a>";
    }
    
    if($page >= $pages) {
        $naesta = "Næsta &gt;&gt;";
    }
    else {
        $next = $page + 1;
        $naesta = "<a href='$slod$sam$next'>Næsta &gt;&gt;</a>";
    }
    
    $num0 = $num1 = $num2 = $dots1 = $numkm2 = $numkm1 = $numk = $numkp1 = $dots2 = $numkp2 = $numnm2 = $numnm1 = $numn = "";
    
    $tala1b = $max_per_page;
    $tala2a = $max_per_page + 1;
    $tala2b = 2*$max_per_page;
    $tala3a = 2*$max_per_page + 1;
    $tala3b = 3*$max_per_page;
    $tala4a = 3*$max_per_page + 1;
    $tala4b = 4*$max_per_page;
    $tala5a = 4*$max_per_page + 1;
    
    if($pages == 0) {
        $numn = "1 - $num_of_things";
    }
    elseif($pages == 1) {
        $num0 = "<a href='$slod$sam$t0'>1 - $tala1b</a>";
        $numn = " | <a href='$slod$sam$t1'>$tala2a - $num_of_things</a>";
        if($page == 0) {
            $num0 = "1 - $tala1b";
        }
        elseif($page == 1) {
            $numn = " | $tala2a - $num_of_things";
        }
    }
    elseif($pages == 2) {
        $num0 = "<a href='$slod$sam$t0'>1 - $tala1b</a>";
        $num1 = " | <a href='$slod$sam$t1'>$tala2a - $tala2b</a>";
        $numn = " | <a href='$slod$sam$t2'>$tala3a - $num_of_things</a>";
        if($page == 0) {
            $num0 = "1 - $tala1b";
        }
        elseif($page == 1) {
            $num1 = " | $tala2a - $tala2b";
        }
        elseif($page == 2) {
            $numn = " | $tala3a - $num_of_things";
        }
    }
    elseif($pages == 3) {
        $num0 = "<a href='$slod$sam$t0'>1 - $tala1b</a>";
        $num1 = " | <a href='$slod$sam$t1'>$tala2a - $tala2b</a>";
        $num2 = " | <a href='$slod$sam$t2'>$tala3a - $tala3b</a>";
        $numn = " | <a href='$slod$sam$t3'>$tala4a - $num_of_things</a>";
        if($page == 0) {
            $num0 = "1 - $tala1b";
        }
        elseif($page == 1) {
            $num1 = " | $tala2a - $tala2b";
        }
        elseif($page == 2) {
            $num2 = " | $tala3a - $tala3b";
        }
        elseif($page == 3) {
            $numn = " | $tala4a - $num_of_things";
        }
    }
    elseif($pages == 4) {
        $num0 = "<a href='$slod$sam$t0'>1 - $tala1b</a>";
        $num1 = " | <a href='$slod$sam$t1'>$tala2a - $tala2b</a>";
        $num2 = " | <a href='$slod$sam$t2'>$tala3a - $tala3b</a>";
        $numnm1 = " | <a href='$slod$sam$t3'>$tala4a - $tala4b</a>";
        $numn = " | <a href='$slod$sam$t4'>$tala5a - $num_of_things</a>";
        if($page == 0) {
            $num0 = "1 - $tala1b";
        }
        elseif($page == 1) {
            $num1 = " | $tala2a - $tala2b";
        }
        elseif($page == 2) {
            $num2 = " | $tala3a - $tala3b";
        }
        elseif($page == 3) {
            $numnm1 = " | $tala4a - $tala4b";
        }
        elseif($page == 4) {
            $numn = " | $tala5a - $num_of_things";
        }
    }
    elseif($pages >= 5) {
        $km2 = $page - 2;
        $km1 = $page - 1;
        $kp1 = $page + 1;
        $kp2 = $page + 2;
        $nm2 = $pages - 2;
        $nm1 = $pages - 1;
        
        $km2_i1 = $km2*$max_per_page + 1;
        $km2_i2 = ($km2+1)*$max_per_page;
        $km1_i1 = $km1*$max_per_page + 1;
        $km1_i2 = ($km1+1)*$max_per_page;
        $k_i1 = $page*$max_per_page + 1;
        $k_i2 = ($page+1)*$max_per_page;
        $kp1_i1 = $kp1*$max_per_page + 1;
        $kp1_i2 = ($kp1+1)*$max_per_page;
        $kp2_i1 = $kp2*$max_per_page + 1;
        $kp2_i2 = ($kp2+1)*$max_per_page;
        
        $nm2_i1 = $nm2*$max_per_page + 1;
        $nm2_i2 = ($nm2+1)*$max_per_page;
        $nm1_i1 = $nm1*$max_per_page + 1;
        $nm1_i2 = ($nm1+1)*$max_per_page;
        $n_i1 = $pages*$max_per_page + 1;
        
        $num0 = "<a href='$slod$sam$t0'>1 - $tala1b</a>";
        $num1 = " | <a href='$slod$sam$t1'>$tala2a - $tala2b</a>";
        $num2 = " | <a href='$slod$sam$t2'>$tala3a - $tala3b</a>";
        $numnm2 = "<a href='$slod$sam$nm2'>$nm2_i1 - $nm2_i2</a>";
        $numnm1 = " | <a href='$slod$sam$nm1'>$nm1_i1 - $nm1_i2</a>";
        $numn = " | <a href='$slod$sam$pages'>$n_i1 - $num_of_things</a>";
        if($page == 0) {
            $num0 = "1 - $tala1b";
        }
        elseif($page == 1) {
            $num1 = " | $tala2a - $tala2b";
        }
        elseif($page == 2) {
            $num2 = " | $tala3a - $tala3b";
        }
        elseif($page == $pages - 2) {
            $numnm2 = "$nm2_i1 - $nm2_i2";
        }
        elseif($page == $pages - 1) {
            $numnm1 = " | $nm1_i1 - $nm1_i2";
        }
        elseif($page == $pages) {
            $numn = " | $n_i1 - $num_of_things";
        }
        
        if($km2 < $nm2 && $km2 > 2) {
            $numkm2 = "<a href='$slod$sam$km2'>$km2_i1 - $km2_i2</a>";
        }
        if($km1 < $nm2 && $km1 > 2) {
            $numkm1 = " | <a href='$slod$sam$km1'>$km1_i1 - $km1_i2</a>";
        }
        if($page < $nm2 && $page > 2) {
            $numk = " | $k_i1 - $k_i2";
        }
        if($kp1 < $nm2 && $kp1 > 2) {
            $numkp1 = " | <a href='$slod$sam$kp1'>$kp1_i1 - $kp1_i2</a>";
        }
        if($kp2 < $nm2 && $kp2 > 2) {
            $numkp2 = " | <a href='$slod$sam$kp2'>$kp2_i1 - $kp2_i2</a>";
        }
    }
    
    if($page > 5) {
        $dots1 = " | ... | ";
    }
    elseif($page == 5) {
        $dots1 = " | ";
    }
    
    if($page < $pages - 5) {
        $dots2 = " | ... | ";
    }
    elseif($page >= $pages - 5 && $page < $pages && $pages >= 5) {
        $dots2 = " | ";
    }
    
    $return = "$num0$num1$num2$dots1$numkm2$numkm1$numk$numkp1$numkp2$dots2$numnm2$numnm1$numn<br /> $fyrri &nbsp;&nbsp;&nbsp;&nbsp; $naesta";
    
    return $return;
}
?>