PHP show_source() alias of highlight_file() that displays highlighted PHP source. The examples below show how the call behaves, where it is useful, and which limitations matter.
What Is show_source() in PHP?
Alias of highlight_file() that displays highlighted PHP source.
Its call structure is:
show_source($filename, [$return])The arguments identify the values or resources passed to show_source(). Read the examples with attention to the type of each supplied argument and to whether the function modifies its input or returns a separate result.
Example 1: Basic Usage
This example introduces show_source with a direct call and a small, readable input.
<?php
show_source(__FILE__, true);Alias of highlight_file() that displays highlighted PHP source. Do not publicly expose sensitive PHP source files or credentials.
Example 2: Another Behavior or Input
Compare this input with the previous example: changing the data or option can affect how show_source behaves.
<?php
highlight_file(__FILE__, true);The changed input illustrates why output may differ with the chosen values or environment. Do not publicly expose sensitive PHP source files or credentials.
Practical Example: Using the Feature
The following example incorporates show_source into a workflow. Values such as paths, connection handles and configuration options must come from trusted application settings.
<?php
if (is_file($sourcePath)) { $highlighted = show_source($sourcePath, true); echo strlen($highlighted); }In a real application, check each operation result, validate values before use and clean up acquired resources. Do not publicly expose sensitive PHP source files or credentials.
Important Behavior and Edge Cases
- Purpose: Alias of highlight_file() that displays highlighted PHP source.
- Key limitation: Do not publicly expose sensitive PHP source files or credentials.
- 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 |
|---|---|
show_source() | Alias of highlight_file() that displays highlighted PHP source. |
highlight_file() | Highlights PHP source using the canonical function; show_source() is an alias. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Do not publicly expose sensitive PHP source files or credentials. | The correct approach depends on this behavior: Do not publicly expose sensitive PHP source files or credentials. |
| 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
- Alias of highlight_file() that displays highlighted PHP source.
- Do not publicly expose sensitive PHP source files or credentials.
- Use the examples as starting points, and adapt environmental paths, resources and permissions rather than assuming fixed results.
show_source is useful when its specific behavior fits the problem. The safest implementations combine the correct API with input validation, error checking and resource cleanup.