PHP - Cortar imágenes en un image uploader

$('#updloadImage').on('change',function(){

    if($(this).val() != ''){

        var formData= new FormData($('#formulario-register')[0]);

        $.ajax({

            type: 'POST',

            url: base_url+'frontend/web_private/subir_imagen',

            data: formData,

            contentType: false,

            processData: false,

            beforeSend: function(){

                $('#cargar').show();

                $('#btn-publicar').attr('disabled','disabled');

                $('#btn-publicar2').attr('disabled','disabled');

                $('#upload').attr('disabled','disabled');

                $('#updloadImage').attr('disabled','disabled');

            },

            success: function(data){

                //$('#result').html(data);

                $('#imagenes').append('<div class="col-md-6"><i class="fa fa-close pull-right" style="cursor: pointer; z-index: 100;" data-in="'+data+'"></i><img style="padding: 10px; margin: 5px 0px; border: 1px #000 solid; width: 100%; height: 150px;" class="img-rounded"  src="'+base_url+'uploads/publicaciones/'+data+'"></div>');

                $('#lista-imagenes').append('<p>..imagen'+$('#imagenes img').length+'</p>');

                $('#cargar').hide();

                $('#btn-publicar').removeAttr('disabled');

                $('#btn-publicar2').removeAttr('disabled');

                $('#upload').removeAttr('disabled');

                $('#updloadImage').removeAttr('disabled');

                $('#imagenes i').on('click',function(){

                    $.ajax({

                        type: 'post',

                        url: base_url+'frontend/web_private/eliminar_imagenes',

                        data: {

                            imagen: $(this).attr('data-in')

                        }

                    });

                    $(this).parent().remove();

                    $('#lista-imagenes p:last').remove();

                });

            }

        });

    }

});

</script>