PHP SplFileObject::fputcsv() Method: Usage and Examples

In PHP, SplFileObject::fputcsv() is useful when your application needs a specific operation rather than manually reproducing it. Writes a structured row as a CSV record with proper quoting of the fields.

The SplFileObject class combines file I/O with iterator behavior. Close the object before cleaning up a temporary file.

What Is fputcsv() in PHP?

Writes a structured row as a CSV record with proper quoting of the fields.

Signature:

SplFileObject::fputcsv(array $fields, string $separator = ',', string $enclosure = '"', string $escape = '\\', string $eol = '
'): mixed

Parameters:

• $fields — Array of field values to write as one CSV record.
• $separator — CSV field delimiter character.
• $enclosure — Character surrounding quoted CSV fields.
• $escape — CSV escape character; avoid reliance on the legacy default in new code.
• $eol — Line ending appended to the generated CSV row.

Return value: The return type depends on the result of this operation; inspect errors and exceptions as documented for the API..

Example 1: Basic Usage

This first example shows the method or function in a minimal context. For environment-dependent operations, adapt the required path, stream or connection before running it.

<?php

$tempPath = tempnam(sys_get_temp_dir(), "php-guide-");
file_put_contents($tempPath, "First line\nSecond line\n");
$file = new SplFileObject($tempPath, "r+");
$writtenBytes = $file->fputcsv(["First", "Second"], ',', '"', '');
var_dump($writtenBytes);
$file = null;
unlink($tempPath);

The important operation is SplFileObject::fputcsv(). Writes a structured row as a CSV record with proper quoting of the fields.

Example 2: Another Input or Scenario

The next example changes the input or surrounding context to show how the operation behaves in a second situation.

<?php

$tempPath = tempnam(sys_get_temp_dir(), "php-guide-");
file_put_contents($tempPath, "Name,Score\nAda,93\nLeo,88\n");
$file = new SplFileObject($tempPath, "r+");
$writtenBytes = $file->fputcsv(["First", "Second"], ',', '"', '');
var_dump($writtenBytes);
$file = null;
unlink($tempPath);

Compare the inputs and the handling of the return value with the first example. Avoid assuming that filesystem paths, resource states or binary bytes are interchangeable.

Practical Example: Applying the Operation

This example illustrates how the operation fits into a small application workflow. Paths, streams and secrets must be created or provided securely by the calling application.

<?php

$tempPath = tempnam(sys_get_temp_dir(), "php-guide-");
file_put_contents($tempPath, "Name,Score\nAda,93\nLeo,88\n");
$file = new SplFileObject($tempPath, "r+");
$file->setFlags(SplFileObject::DROP_NEW_LINE);
$writtenBytes = $file->fputcsv(["First", "Second"], ',', '"', '');
var_dump($writtenBytes);
$file = null;
unlink($tempPath);

Practical note: Writes a structured row as a CSV record with proper quoting of the fields.

Important Behavior and Edge Cases

• Writes a structured row as a CSV record with proper quoting of the fields.
• Check failure values and exceptions; do not assume every environment supports the same stream wrapper, extension or filesystem capability.
• When handling paths, streams or external input, validate inputs before using results and release resources after use.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• SplFileObject::fputcsv() writes a structured row as a CSV record with proper quoting of the fields.
• Use appropriate input types and verify results before continuing.
• Prefer specialized, safer APIs when the operation concerns untrusted input, encryption or network traffic.

In summary: Writes a structured row as a CSV record with proper quoting of the fields. Build in error handling and use this function where its specific behavior matches the application requirements.