The header location jump failure is usually caused by the output being triggered in advance or the logic is not executed to the jump. 1. Make sure there is no output before the header, including spaces, BOM characters and echo/print statements; 2. Check whether the form method and action are correct, and confirm that the logical branch is executed to the jump position; 3. Add exit/die to the header and terminate the subsequent code; 4. Use JS jump temporarily to replace but not recommended solution if necessary. Solve the output, logic and termination statements in order.
The PHP header location jump failed after form submission, which is quite common in development. Generally speaking, either the code is written incorrectly or the output is triggered in advance, causing the header to be unable to send normally.
There cannot be any actual output before outputting the content
header() function of PHP must be called before any actual output, otherwise it will fail. This means that you cannot have any HTML, spaces, echo, print or error message output before executing header("Location: xxx") .
Common situations include:
- There are blank or BOM characters in front of the file
- I accidentally used echo, print_r, var_dump in front of the header
- PHP error message is displayed (such as notice or warning)
For example, if you wrote code like this:
<?php
echo "Processing...";
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
header("Location: thanks.php");
exit;
}
?> Then this echo will cause the header to fail. The solution is simple: make sure there is no output before the header.
Is the form submission logic executed correctly?
Sometimes the jump does not take effect, it is not a grammatical problem, but the logic has not reached the header step. for example:
- The form is not submitted correctly to the current script
- The conditional judgment is not valid and the jump branch is not entered
- Incorrect judgment of the submission method (for example, only POST is judged, but it is actually GET submission)
You can check the following points:
- Is
method="post"and action addresses of the form correct? - Whether there is a judgment like
if ($_SERVER['REQUEST_METHOD'] === 'POST') - Whether other logical processing was done before jumping caused the process to be interrupted
A simple test method is to add a sentence die("Here"); before the jump to see if the page outputs this sentence. If there is no output or an error is reported, it means that the execution has not ended here at all.
Use exit or die to ensure that subsequent code stops
Even if you write header("Location: ...") , if there is still code behind it, it may result in unexpected results. Therefore, it is recommended to add:
exit; // or die;
This prevents subsequent code from continuing to run and avoids some potential problems.
Alternative: Jump with JavaScript (not recommended but available)
If you really can't handle the header problem, you can also consider using JS to implement jumps. Although it is not as clean as the header, it can at least be "temporary emergency":
echo '<script>window.location.href = "thanks.php";</script>'; exit;
However, this is just a temporary solution, and ultimately, we must check the root cause of the header problem.
Basically, these common causes and solutions. These types of issues are usually not complicated, but details are easily overlooked. When encountering, check the output, logic and termination statements in order, which can generally be done.
The above is the detailed content of PHP header location not working after form submit. For more information, please follow other related articles on the PHP Chinese website!
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