PHP: display value of PHP variables inside a string-CodePudding

so I have this code and I need to parse the PHP variables inside the string. the $string here is a response from an API and I have no control over the output. I need to echo it out and display the value of the variables inside the string to an HTML page.

<?php
    $product = "Test Product";
    $lot_number = "123123123";
    
    $string = '<table style="width: 100.378%;" border="\">
    <tbody>
    <tr>
    <td style="width: 10.4834%;"><strong>Product</strong></td>
    <td style="width: 35.6575%;">$lot_number</td>
    <td style="width: 11.9257%;"><strong>Lot No.</strong></td>
    <td style="width: 41.9335%;">$lot_number</td>
    </tr>
    </tbody>
    </table>';

    echo "$string";

?>

This is the output of this code

and this is the output I am trying to achieve.

Any idea how to do this? Thank you!

CodePudding user response：

Make the first single quote ' to double " and vice versa.

<?php
    $product = "Test Product";
    $lot_number = "123123123";
    
    $string = "<table style='width: 100.378%;' border='\'>
    <tbody>
    <tr>
    <td style='width: 10.4834%;'><strong>Product</strong></td>
    <td style='width: 35.6575%;''> $product </td>
    <td style='width: 11.9257%;'><strong>Lot No.</strong></td>
    <td style='width: 41.9335%;''> $lot_number</td>
    </tr>
    </tbody>
    </table>";

    echo $string;

?>

CodePudding user response：

Multiple ways to do it. The simplest way in your current case would be to close and reopen the parts where you will print the php variables. Like "abc " . $var . " def";


<?php
    $product = "Test Product";
    $lot_number = "123123123";
    
    $string = '<table style="width: 100.378%;" border="\">
    <tbody>
    <tr>
    <td style="width: 10.4834%;"><strong>Product</strong></td>
    <td style="width: 35.6575%;">'. $product . '</td>
    <td style="width: 11.9257%;"><strong>Lot No.</strong></td>
    <td style="width: 41.9335%;">' . $lot_number .'</td>
    </tr>
    </tbody>
    </table>';

    echo "$string";

?>

UPDATE

You can then use the str_replace (https://www.php.net/manual/de/function.str-replace.php) function to fill the variables.

<?php
    $product = "Test Product";
    $lot_number = "123123123";
    
    $string = '<table style="width: 100.378%;" border="\">
    <tbody>
    <tr>
    <td style="width: 10.4834%;"><strong>Product</strong></td>
    <td style="width: 35.6575%;"> $product </td>
    <td style="width: 11.9257%;"><strong>Lot No.</strong></td>
    <td style="width: 41.9335%;"> $lot_number </td>
    </tr>
    </tbody>
    </table>';

    #echo "$string";
    


$string = str_replace('$product', $product, $string);
$string = str_replace('$lot_number' , $lot_number , $string);
echo $string;

CodePudding user response：

If you have only two variables just use this code:

<?php

$product = "Test Product";
$lot_number = "123123123";

$stringFromApi = '<table style="width: 100.378%;">
    <tbody>
        <tr>
            <td style="width: 10.4834%;"><strong>Product</strong></td>
            <td style="width: 35.6575%;">$lot_number</td>
            <td style="width: 11.9257%;"><strong>Lot No.</strong></td>
            <td style="width: 41.9335%;">$lot_number</td>
        </tr>
    </tbody>
</table>';

$search = ['$product', '$lot_number'];
$replace = [$product, $lot_number];
$string = str_replace($search, $replace, $stringFromApi);
echo $string;

CodePudding user response：

Since you use single quotes you cannot add variables inside the string unless you use a curly brace or a dot.

Note: using the double quotations method is faster than using the using curly braces or a dot.

If you want to echo a variable and use a single quoted string in php you have to "glue" the parts together.

There are 2 ways to do this, they are both equally as fast and it's just a matter of personal preference what you want to use.

<?php

//Double quotations
$car = "mercedes";
echo "the car brand is a $car<br>";
$type = "Question";
echo "Hi! I just posted a {$type}<br>";

//Single quotations
$name = "StackOverFlow";
echo 'Hi! my name is: ' . $name; 
?>

CodePudding user response：

It works for you. There are two string operators. The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments.

<?php
        $product = "Test Product";
        $lot_number = "123123123";
        
        $string = '<table style="width: 100.378%;" border="\">
        <tbody>
        <tr>
        <td style="width: 10.4834%;"><strong>Product</strong></td>
        <td style="width: 35.6575%;">'.$product.'</td>
        <td style="width: 11.9257%;"><strong>Lot No.</strong></td>
        <td style="width: 41.9335%;">'.$lot_number.'</td>
        </tr>
        </tbody>
        </table>';
    
        echo $string;
    
    ?>

For more information: https://www.php.net/manual/en/language.operators.string.php. Example

<?php
$a = '12345';

// This works:
echo "qwe{$a}rty"; // qwe12345rty, using braces
echo "qwe" . $a . "rty"; // qwe12345rty, concatenation used

// Does not work:
echo 'qwe{$a}rty'; // qwe{$a}rty, single quotes are not parsed
echo "qwe$arty"; // qwe, because $a became $arty, which is undefined
?>