if( ! is_uploaded_file( $_FILES['imageUpload']['tmp_name']) || $_FILES['imageUpload']['error'] !== UPLOAD_ERR_OK) {
    echo "<p class='alert alert-danger text-danger font-size-16'>Selecione uma image para enviar.</p>";
    exit();
}

$maxFileSize = 5242880;
if($_FILES['imageUpload']['size'] > $maxFileSize) {
    echo "<p class="alert alert-danger text-danger font-size-16">Tamanho de arquivo maior do que o permitido.</p>";
    exit();
}
##############################################
if(is_array(getimagesize($_FILES["imageUpload"]["tmp_name"]))){
    $image_type_check = 'true';
} else {
    $image_type_check = 'false';
}
if($image_type_check == 'false') {
    echo "<p class="alert alert-danger text-danger font-size-16">Formato de arquivo não permitido.</p>";
    exit();
}

$filename = $_FILES['imageUpload']['name'];
$location = "../arquivos/";
$imagename = $_FILES['imageUpload']['name'];
$source = $_FILES['imageUpload']['tmp_name'];
$ext = explode( ".", $imagename );
$ext = end( $ext );
$nN = md5( $filename );
$nN = time() . $nN;
$novo_nome = $nN . "." . $ext;
$target = $location . $novo_nome;

$image_info = getimagesize($_FILES["imageUpload"]["tmp_name"]);
$image_width = $image_info[0];
$image_height = $image_info[1];

if($image_width>800) {
    move_uploaded_file($source, $target);
    $imagepath = $novo_nome;
    $save = $location . $imagepath;
    $file = $location . $imagepath;
    list($width, $height) = getimagesize($file) ;
    $modwidth = 800;
    $diff = $width / $modwidth;
    $modheight = $height / $diff;
    $tn = imagecreatetruecolor($modwidth, $modheight) ;
    $image = imagecreatefromjpeg($file) ;
    imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
    imagejpeg($tn, $save, 72);
} else if($image_width<800) {
    move_uploaded_file( $source, $target );
    $imagepath = $novo_nome;
    $save = $location . $imagepath;
    $file = $location . $imagepath;
    list($width, $height) = getimagesize($file) ;
    $modwidth = $image_width;
    $diff = $width / $modwidth;
    $modheight = $height / $diff;
    $tn = imagecreatetruecolor($modwidth, $modheight) ;
    $image = imagecreatefromjpeg($file) ;
    imagecopyresampled($tn, $image, 0, 0, 0, 0, $modwidth, $modheight, $width, $height) ;
    imagejpeg($tn, $save, 72);
}

Array
(
    [0] => nota-12809312-001.jpg
    [1] => nota-74831223-004.png
    [2] =>
    [3] =>
    [4] =>
    [5] =>
    [6] =>
    [7] =>
    [8] =>
    [9] =>
    [10] =>
    [11] =>
)

$count = count( $_FILES['imageUpload']['name'] );

if( $count == 0 ) {
    echo "<p class="alert alert-danger text-danger font-size-16">Selecione uma imagem para o anúncio.</p>";
    exit();
}

#### UPLOAD DAS IMAGENS
$maxFileSize = 5242880;
$imgError = 0;
$imgErrorFile = array();
$uploadSuccess = 0;

for( $x=1;$x<=$count;$x++ ) {
    if(is_array(getimagesize($_FILES["imageUpload"]["tmp_name"][$x]))){
        $image_type_check = 'true';
    } else {
        $image_type_check = 'false';
    }
    if($image_type_check == 'false') {
        echo "<p class="alert alert-danger text-danger font-size-16">Formato de arquivo não permitido.</p>";
        exit();
    }
    if( $_FILES['imageUpload']['size'][$x] > $maxFileSize ) {
        echo "<p class="alert alert-danger text-danger font-size-16">Tamanho de arquivo maior do que o permitido.</p>";
        exit();
    }

$count = count( $_FILES['imageUpload']['name'] );

if( $count == 0 ) {
    echo "<p class="alert alert-danger text-danger font-size-16">Selecione uma imagem para o anúncio.</p>";
    exit();
}

$maxFileSize = 5242880;

for( $x=0;$x<$count;$x++ ) {
    if(is_array(getimagesize($_FILES["imageUpload"]["tmp_name"][$x]))){
        $image_type_check = 'true';
    } else {
        $image_type_check = 'false';
    }
    if($image_type_check == 'false') {
        echo "<p class="alert alert-danger text-danger font-size-16">Formato de arquivo não permitido.</p>";
        exit();
    }
    if( $_FILES['imageUpload']['size'][$x] > $maxFileSize ) {
        echo "<p class="alert alert-danger text-danger font-size-16">Tamanho de arquivo maior do que o permitido.</p>";
        exit();
    }