When handling files in your application, minimize memory usage to optimize performance. Follow these guidelines: 1. **Avoid multiple reads**: Read file content only once and reuse it throughout your code. Each read operation loads the entire file into memory.
When handling files in your application, minimize memory usage to optimize performance. Follow these guidelines:
Avoid multiple reads: Read file content only once and reuse it throughout your code. Each read operation loads the entire file into memory.
Use metadata functions: When you only need file information (not content), use metadata functions like filesize() instead of reading the file.
Consider streaming: For large files, use stream operations instead of loading the entire content into memory.
Example refactoring:
// Before: Inefficient - reads file twice and holds it twice in memory
public static function fromFile(string $filename, string $contentType): self
{
$data = file_get_contents($filename); // First read
$attachmentItemHeader = [
'type' => 'attachment',
'filename' => $filename,
'content_type' => $contentType,
'length' => strlen($data), // Requires second read or keeping in memory
];
return new self($data, $filename, $contentType);
}
// After: Efficient - reads file once, uses filesize() for metadata
public static function fromFile(string $filename, string $contentType): self
{
// Use metadata function instead of reading content
$fileLength = filesize($filename);
$attachmentItemHeader = [
'type' => 'attachment',
'filename' => $filename,
'content_type' => $contentType,
'length' => $fileLength, // No need to read content for length
];
// Read content only when needed
$data = file_get_contents($filename);
return new self($data, $filename, $contentType);
}
For very large files, consider using stream operations to process the file incrementally rather than loading it entirely into memory.
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