PHP var_export() returns or prints a parsable PHP representation of a value. The examples below show how the call behaves, where it is useful, and which limitations matter.
What Is var_export() in PHP?
Returns or prints a parsable PHP representation of a value.
Its call structure is:
var_export($value, [$return])The value is exported; when return is true, the representation is returned rather than printed.
Example 1: Basic Usage
This example introduces var_export with a direct call and a small, readable input.
<?php
echo var_export(["a" => 1], true);Output:
array (
'a' => 1,
)Returns or prints a parsable PHP representation of a value. Not every exported object is reconstructible; do not evaluate untrusted exports.
Example 2: Another Behavior or Input
Compare this input with the previous example: changing the data or option can affect how var_export behaves.
<?php
var_export(true);Output:
trueThe changed input illustrates why output may differ with the chosen values or environment. Not every exported object is reconstructible; do not evaluate untrusted exports.
Practical Example: Using the Feature
The following example incorporates var_export into a workflow. Values such as paths, connection handles and configuration options must come from trusted application settings.
<?php
$settings = ["mode" => "safe", "retry" => 3]; $representation = var_export($settings, true); echo $representation;Output:
array (
'mode' => 'safe',
'retry' => 3,
)In a real application, check each operation result, validate values before use and clean up acquired resources. Not every exported object is reconstructible; do not evaluate untrusted exports.
Important Behavior and Edge Cases
- Purpose: Returns or prints a parsable PHP representation of a value.
- Key limitation: Not every exported object is reconstructible; do not evaluate untrusted exports.
- Failure handling: Check return values and handle invalid inputs and unavailable operating-system or extension features where relevant.
Comparison With Related Functions
| Function or Approach | Best Fit |
|---|---|
var_export() | Returns or prints a parsable PHP representation of a value. |
print_r() | Prints a readable representation with less type detail than var_dump(). |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Not every exported object is reconstructible; do not evaluate untrusted exports. | The correct approach depends on this behavior: Not every exported object is reconstructible; do not evaluate untrusted exports. |
| Ignoring errors or cleanup after the operation. | Validate inputs and check each result; close files, restore settings or release resources when the operation requires it. |
Key Takeaways
- Returns or prints a parsable PHP representation of a value.
- Not every exported object is reconstructible; do not evaluate untrusted exports.
- Use the examples as starting points, and adapt environmental paths, resources and permissions rather than assuming fixed results.
var_export is useful when its specific behavior fits the problem. The safest implementations combine the correct API with input validation, error checking and resource cleanup.