How to get and count images with php?

Itere the received array of the global variable $_FILES

// Obtém o tamanho do array, ou seja, a quantidade de imagens recebidas
$count = count($_FILES['pic']['tmp_name']);

// Faz a iteração
for ($i = 0; $i < $count; $i++) {
    $file_name = $_FILES['pic']['name'][$i]; // nome do arquivo
    $file_type = $_FILES['pic']['type'][$i]; // tipo
    $file_error = $_FILES['pic']['error'][$i]; // código de erro do upload, se houver
    $file_size = $_FILES['pic']['size'][$i]; // tamanho em bytes
    $file_path = $_FILES['pic']['tmp_name'][$i]; // caminho completo do path temporário.
}

PHP groups uploaded files with the same name in a less intuitive way, I've created a function ( link ) that interprets the received values in a way that allows for the treatment as suggested in the Uploading Files with Method POST is the same regardless of whether you receive one or more files.

When calling parse_files() , a numeric suffix is added to the form field name, so that the data is as follows:

// estrutura original 
echo $_FILES['pic']['name'][0]; // exemplo1.jpg
echo $_FILES['pic']['name'][1]; // exemplo2.jpg
// estrutura depois do tratamento
$files = parse_files();
echo $files['pic_0']['name']; // exemplo1.jpg
echo $files['pic_1']['name']; // exemplo2.jpg

In addition, as the Undefined index: pic error was reported, your form should not contain the enctype="multipart/form-data" attribute, which should be causing some of the problem.

Function definition if link above is inaccessible.

<?php
/**
 * Parses the PHP's $_FILES array when multiple file input is used, it will
 * return an array as each file was from a different input. It also works
 * when multiple and single inputs are mixed
 * 
 * @author   Pedro Sanção
 * @license  MIT Licence
 */
function parse_files() {
    $files = array();
    foreach ($_FILES as $fieldName => $file) {
        reset($file);
        $key = key($file);
        if (is_array($file[$key])) {
            $propeties = array_keys($file);
            $fieldNamekeys = array_keys($file[$key]);
            foreach ($fieldNamekeys as $namekey) {
                $fileKey = "{$fieldName}_{$namekey}";
                $files[$fileKey] = array();
                foreach ($propeties as $property) {
                    $files[$fileKey][$property] = $file[$property][$namekey];
                }
            }
        } else {
            $files[$fieldName] = $file;
        }
    }
    return $files;
}