库存应用程序不会显示结果

Question

我应该为库存管理应用程序制作一个 php 程序。

我有主程序，还有一个测试程序，以确保一切正常

我确实有大部分工作的代码

库存.php

class Product

{

// ----------------------------------------- Properties -----------------------------------------

private $product_name = "no name";

private $product_code = 0;

private $product_price = 0;

private $product_quantity = 0;

private $product_needs = "no needs";

private $error_message = "??";

// ---------------------------------- Set Methods ----------------------------------------------

function set_product_name($value)

{

$error_message = TRUE;

(ctype_alpha($value) && strlen($value) <= 20) ? $this->product_name = $value : $this->error_message = FALSE;

return $this->error_message;

}

function set_product_code($value)

{

$error_message = TRUE;

(ctype_digit($value) && ($value > 0 && $value <= 6)) ? $this->product_code = $value : $this->error_message = FALSE;

return $this->error_message;

}

function set_product_price($value)

{

$error_message = TRUE;

(ctype_digit($value) && ($value > 0 && $value <= 6)) ? $this->product_price = $value : $this->error_message = FALSE;

return $this->error_message;

}

function set_product_quantity($value)

{

$error_message = TRUE;

(ctype_digit($value) && ($value > 0 && $value <= 6)) ? $this->product_quantity = $value : $this->error_message = FALSE;

return $this->error_message;

}

function set_product_needs($value)

{

$error_message = TRUE;

(ctype_alpha($value) && strlen($value) <= 40) ? $this->product_needs = $value : $this->error_message = FALSE;

return $this->error_message;

}

// ----------------------------------------- Get Methods ------------------------------------------------------------

function get_product_name()

{

return $this->product_name;

}

function get_product_code()

{

return $this->product_code;

}

function get_product_price()

{

return $this->product_price;

}

function get_product_quantity()

{

return $this->product_quantity;

}

function get_product_needs()

{

return $this->product_needs;

}

Answer 1

您的 Product 类 Product 应如下所示class Product {&nbsp; &nbsp; private $product_name = "no name";&nbsp; &nbsp; private $product_code = 0;&nbsp; &nbsp; private $product_price = 0;&nbsp; &nbsp; private $product_quantity = 0;&nbsp; &nbsp; private $product_needs = "no needs";&nbsp; &nbsp; function get_product_name() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_name;&nbsp; &nbsp; }&nbsp; &nbsp; function set_product_name($value) {&nbsp; &nbsp; &nbsp; &nbsp; $this->product_name = $value;&nbsp; &nbsp; }&nbsp; &nbsp; function get_product_code() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_code;&nbsp; &nbsp; }&nbsp; &nbsp; function set_product_code($value) {&nbsp; &nbsp; &nbsp; &nbsp; $this->product_code = $value;&nbsp; &nbsp; }&nbsp; &nbsp; function get_product_price() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_price;&nbsp; &nbsp; }&nbsp; &nbsp; function set_product_price($value) {&nbsp; &nbsp; &nbsp; &nbsp; $this->product_price = $value;&nbsp; &nbsp; }&nbsp; &nbsp; function get_product_quantity() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_quantity;&nbsp; &nbsp; }&nbsp; &nbsp; function set_product_quantity($value) {&nbsp; &nbsp; &nbsp; &nbsp; $this->product_quantity = $value;&nbsp; &nbsp; }&nbsp; &nbsp; function get_product_needs() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_needs;&nbsp; &nbsp; }&nbsp; &nbsp; function set_product_needs($value) {&nbsp; &nbsp; &nbsp; &nbsp; $this->product_needs = $value;&nbsp; &nbsp; }&nbsp; &nbsp; function get_properties() {&nbsp; &nbsp; &nbsp; &nbsp; return $this->product_name . ' ' . $this->product_code . ' ' . $this->product_price . ' ' . $this->product_quantity . ' ' . $this->product_needs;&nbsp; &nbsp; }}所以你可以创建一个实例并获得正确的值//lab.php$product = new Product();$product->set_product_code(1234);print $product->get_product_code(); // print 1234所有验证都应在产品模型之外进行$product_quantity = '7.5';if(is_numeric($product_quantity)) { // check if is numeric&nbsp; &nbsp; $product->set_product_quantity($product_quantity); // set the product quantity&nbsp; &nbsp; print "Quantity update successful<br />"; // show successful messages} else {&nbsp; &nbsp; print "Quantity update is not successful<br />";}

Answer 2

这应该使它工作。主要问题是如何处理字符串和数值。有足够的空间进行其他结构改进:)。库存.php<?phpclass Product{// ----------------------------------------- Properties -----------------------------------------private $product_name = "no name";private $product_code = 0;private $product_price = 0;private $product_quantity = 90;private $product_needs = "no needs";private $error_message = "??";// ---------------------------------- Set Methods ----------------------------------------------function set_product_name($value){$error_message = TRUE;(ctype_alpha($value) && strlen($value) <= 20) ? $this->product_name = $value : $this->error_message = FALSE;return $this->error_message;}function set_product_code($value){$error_message = TRUE;(is_numeric($value) && ($value > 0 && $value <= 999999)) ? $this->product_code = $value : $this->error_message = FALSE;return $this->error_message;}function set_product_price($value){$error_message = TRUE;(is_numeric($value) && ($value > 0 && $value <= 999999)) ? $this->product_price = $value : $this->error_message = FALSE;return $this->error_message;}function set_product_quantity($value){$error_message = TRUE;(is_numeric($value) && ($value > 0 && $value <= 999999)) ? $this->product_quantity = $value : $this->error_message = FALSE;return $this->error_message;}function set_product_needs($value){$error_message = TRUE;(preg_match('/[^a-z_\-0-9]/i', $value) && strlen($value) <= 40) ? $this->product_needs = $value : $this->error_message = FALSE;return $this->error_message;}// ----------------------------------------- Get Methods ------------------------------------------------------------function get_product_name(){return $this->product_name;}function get_product_code(){return $this->product_code;}function get_product_price(){return $this->product_price;}function get_product_quantity(){return $this->product_quantity;}function get_product_needs(){return $this->product_needs;}function get_properties(){return "$this->product_name,$this->product_code,$this->product_price,$this->product_quantity,$this->product_needs.";}}实验室.php$lab = new Product;// ------------------------------Set Properties--------------------------$product_error_message = $lab->set_product_name('Hinge');print $product_error_message == TRUE ? 'Name update successful<br/>' : 'Name update not successful<br/>';$product_error_message = $lab->set_product_code(45435);print $product_error_message == TRUE ? 'Code update successful<br />' : 'Code update not successful<br />';$product_error_message = $lab->set_product_price(7.50);print $product_error_message == TRUE ? 'Price update successful<br />' : 'Product update not successful<br />';$product_error_message = $lab->set_product_quantity(75);print $product_error_message == TRUE ? 'Quantity update successful<br />' : 'Quantity update not successful<br />';$product_error_message = $lab->set_product_needs('Wrap in plastic');print $product_error_message == TRUE ? 'Needs update successful<br/>' : 'Needs update not successful<br/>';// ------------------------------Get Properties--------------------------print $lab->get_product_name() . "<br/>";print $lab->get_product_code() . "<br />";print $lab->get_product_price() . "<br />";print $lab->get_product_quantity() . "<br />";print $lab->get_product_needs() . "<br />";$product_properties = $lab->get_properties();list($product_name, $product_code, $product_price, $product_quantity, $product_needs) = explode(',', $product_properties);print "Name: $product_name. Code: $product_code. Price: $product_price. Quantity: $product_quantity. Needs: $product_needs";?>