PHP運行指定的數組數量

Question

使用PHP訂單。我想通過一個數組列表並打印出類似於foreach循環，但僅限於指定數量的數組。

$PRODUCTS = array(
// product abbreviation, product name, unit price 
// follow valid name/ID rules for product abbreviation 
array('prod1', '20" 4:3 (1600 x 1200)', 150), 
array('prod2', '24" 16:9 (1920 x 1200)', 250), 
array('prod3', '32" 16:9 (1920 x 1080)', 300), 
array('prod4', '40" 16:9 (1920 x 1080)', 450), 
array('prod5', '46" LCD 16:9 (1920 x 1080)', 600), 
array('prod6', '55" LCD 16:9 (1920 x 1080)', 800), 
array('prod7', 'Floor Stand (with rental of monitor only)', 100), 
); 

foreach($PRODUCTS as $product) { 
    list($abbr, $name, $price) = $product; 

    // quantity text input 
    $qty_el = $frm->addInput('text', $abbr . '_qty', 0, 
     array('size'=>4, 'class'=>'cur', 'pattern'=>'[0-9]+', 'placeholder'=>0, 
       'onchange'=>'getProductTotal(this)', 
       'onclick'=>'checkValue(this)', 'onblur'=>'reCheckValue(this)')); 

    // total text input 
    $tot_el = $frm->addInput('text', $abbr . '_tot', 0, array('readonly'=>true, 'size'=>8, 'class'=>'cur')); 

    // price hidden input 
    $price_el = $frm->addInput('hidden', $abbr . '_price', $price); 

    $tbl->addRow(); 
     $tbl->addCell($name); 
     $tbl->addCell('$' . number_format($price, 2) . $price_el, 'cur'); 
     $tbl->addCell($qty_el, 'qty'); 
     $tbl->addCell($tot_el); 
} 

我該如何修改它只打印，例如，只有前3個數組？我期望做到這一點的原因是有一個描述標題分解訂單中的幾個產品 - 也許有更好的方法來做到這一點？如有必要，我可以提供更多的代碼。

謝謝！

Answer 1

對於少數產品，在需要時打破環路。使用php break來停止循環。這裏是你的更新代碼：

$PRODUCTS = array(
// product abbreviation, product name, unit price 
// follow valid name/ID rules for product abbreviation 
array('prod1', '20" 4:3 (1600 x 1200)', 150), 
array('prod2', '24" 16:9 (1920 x 1200)', 250), 
array('prod3', '32" 16:9 (1920 x 1080)', 300), 
array('prod4', '40" 16:9 (1920 x 1080)', 450), 
array('prod5', '46" LCD 16:9 (1920 x 1080)', 600), 
array('prod6', '55" LCD 16:9 (1920 x 1080)', 800), 
array('prod7', 'Floor Stand (with rental of monitor only)', 100), 
); 

$i = 0; 

foreach($PRODUCTS as $product) { 
    list($abbr, $name, $price) = $product; 

    // quantity text input 
    $qty_el = $frm->addInput('text', $abbr . '_qty', 0, 
     array('size'=>4, 'class'=>'cur', 'pattern'=>'[0-9]+', 'placeholder'=>0, 
       'onchange'=>'getProductTotal(this)', 
       'onclick'=>'checkValue(this)', 'onblur'=>'reCheckValue(this)')); 

    // total text input 
    $tot_el = $frm->addInput('text', $abbr . '_tot', 0, array('readonly'=>true, 'size'=>8, 'class'=>'cur')); 

    // price hidden input 
    $price_el = $frm->addInput('hidden', $abbr . '_price', $price); 

    $tbl->addRow(); 
     $tbl->addCell($name); 
     $tbl->addCell('$' . number_format($price, 2) . $price_el, 'cur'); 
     $tbl->addCell($qty_el, 'qty'); 
     $tbl->addCell($tot_el); 
    if($i==3){ //you can use any number 
    break; 
    }$i++; 
}