Subir archivos ¿porque solo 19?

[djleonilo]

en este ejemplo seleccione 30 fotos que en realidad son thumbs esto es lo que me imprime con la funcion

print_r($_FILES['imagen']);

este es el resultado

Array ( [name] => Array ( [0] => EFV-1.jpg [1] => EFV-2.jpg [2] => EFV-3.jpg [3] => EFV-4.jpg [4] => EFV-5.jpg [5] => EFV-6.jpg [6] => EFV-7.jpg [7] => EFV-8.jpg [8] => EFV-9.jpg [9] => EFV-10.jpg [10] => EFV-11.jpg [11] => EFV-12.jpg [12] => EFV-13.jpg [13] => EFV-14.jpg [14] => EFV-15.jpg [15] => EFV-16.jpg [16] => EFV-17.jpg [17] => EFV-18.jpg [18] => EFV-19.jpg [19] => EFV-20.jpg ) [type] => Array ( [0] => image/jpeg [1] => image/jpeg [2] => image/jpeg [3] => image/jpeg [4] => image/jpeg [5] => image/jpeg [6] => image/jpeg [7] => image/jpeg [8] => image/jpeg [9] => image/jpeg [10] => image/jpeg [11] => image/jpeg [12] => image/jpeg [13] => image/jpeg [14] => image/jpeg [15] => image/jpeg [16] => image/jpeg [17] => image/jpeg [18] => image/jpeg [19] => image/jpeg ) [tmp_name] => Array ( [0] => /tmp/phpmEjb9M [1] => /tmp/phpIcPpLX [2] => /tmp/phpY5IJn8 [3] => /tmp/php8X47Zi [4] => /tmp/phpktoACt [5] => /tmp/php6GMcfE [6] => /tmp/phpWM0QRO [7] => /tmp/phps8PGuZ [8] => /tmp/phpUjdz79 [9] => /tmp/phpUQoCKk [10] => /tmp/phpey2Knv [11] => /tmp/phpepqX0F [12] => /tmp/phpGwLaEQ [13] => /tmp/phpShquh1 [14] => /tmp/phpIHbYUb [15] => /tmp/phpG1Jvym [16] => /tmp/phpQDm8bx [17] => /tmp/phpUAmMPH [18] => /tmp/phpYJCvtS [19] => /tmp/phpEQyq72 ) [error] => Array ( [0] => 0 [1] => 0 [2] => 0 [3] => 0 [4] => 0 [5] => 0 [6] => 0 [7] => 0 [8] => 0 [9] => 0 [10] => 0 [11] => 0 [12] => 0 [13] => 0 [14] => 0 [15] => 0 [16] => 0 [17] => 0 [18] => 0 [19] => 0 ) [size] => Array ( [0] => 124639 [1] => 106553 [2] => 79283 [3] => 101390 [4] => 104528 [5] => 115557 [6] => 120867 [7] => 132265 [8] => 127031 [9] => 107294 [10] => 94052 [11] => 104151 [12] => 102762 [13] => 112559 [14] => 93356 [15] => 98506 [16] => 112454 [17] => 102542 [18] => 121170 [19] => 99657 ) )

si analizamos veremos solo 19 arreglos en ves de 30.