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Reasons and solutions for not displaying images in html obtained by php

Mar 28, 2023 am 11:26 AM

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In web development, images are often used in HTML pages to enrich the user experience. However, sometimes we may encounter the problem that PHP embeds pictures in HTML, but the pictures cannot be displayed normally. This is a common problem, and this article will explore the causes and solutions to this problem.

1. Cause of the problem

When we use images in HTML pages, we usually need to write the relative or absolute path of the image in the HTML code. However, if we use PHP to embed images, we need to use special PHP statements to call the image file. Here is a simple example that demonstrates how to embed an image in PHP:

&lt;?php
$filename = &quot;image.jpg&quot;;
echo &quot;&lt;img src=&#39;$filename&#39; /&gt;";
?&gt;

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In this example, PHP will look for a file named "image.jpg" on the server and embed it in the HTML page. However, if you run this example on a local server, sometimes the image will not display properly. Why is this?

The main reason is the path problem. When we write the path to an image in PHP code, we need to determine which folder the path is relative to. If we use relative paths, the path may be different than what we expect. Also, if we use an absolute path, we may not be specifying correctly where the image file is located.

Different servers and operating systems may also handle paths differently, which is one of the reasons for the problem. Below we will introduce several solutions to solve this problem.

2. Solution

Use absolute path

Using absolute path can ensure that the code can find the correct image location. Instead of using relative paths, we can specify the full path in the code. For example:

&lt;?php
$filename = &quot;/var/www/html/images/image.jpg&quot;;
echo &quot;&lt;img src=&#39;$filename&#39; /&gt;";
?&gt;

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In this example, we used an absolute path on the server.

Use root relative paths

Using root relative paths can ensure that the code can find the correct image location without being restricted by relative paths. We can use the "/" symbol to represent the root directory of the site, regardless of the folder in which the site is located. For example:

&lt;?php
$filename = &quot;/images/image.jpg&quot;;
echo &quot;&lt;img src=&#39;$filename&#39; /&gt;";
?&gt;

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In this example, we use the root relative path to ensure that the image can be displayed normally.

Using base URL

We can use base URL in HTML code to define the path to the site root directory. In this way, when fetching the image in the PHP code, we can use the base URL to specify the location of the image. For example:

&lt;html&gt;
&lt;head&gt;
&lt;base href=&quot;http://www.example.com/&quot; /&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;?php
$filename = &quot;images/image.jpg&quot;;
echo &quot;&lt;img src=&#39;$filename&#39; /&gt;";
?&gt;
&lt;/body&gt;
&lt;/html&gt;

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In this example, we use the base URL to specify the root directory path of the site.

Summary:

When we embed images in PHP, we may encounter the problem that the images cannot be displayed normally. This problem is usually a path problem. We can solve this problem using absolute path, root relative path or base URL. By specifying the path correctly, we can ensure that the image displays properly and improve the user experience of our website.

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