Specific Examples of Using session_register_shutdown and session_write_close Together in PHP

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// This article discusses specific examples of using session_register_shutdown and session_write_close functions together in PHP.
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<p><?php<br>
/**</p>
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<p>What are specific examples of using session_register_shutdown and session_write_close functions together in PHP?</p>
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<p>In PHP, session_register_shutdown registers a callback function</p>
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<p>that is automatically called when the script finishes executing, used to handle session closing operations.</p>
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<p>Meanwhile, session_write_close actively writes and closes the session, releasing the session file lock,</p>
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<p>allowing subsequent code to continue running without blocking other requests.</p>
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<p>Typical scenarios for combined use:</p>
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<p>Automatically save session data at the end of the script to avoid forgetting to call session_write_close.</p>
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<p>In long-running scripts, close the session early to release locks and improve concurrency performance.</p>
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<p>Use the registered shutdown function to ensure complete writing of session data and prevent data loss.</p>
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<p>Below is a sample code demonstrating how the two work together:<br>
*/</p>
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<p>// Start the session<br>
session_start();</p>
<p>// Assign values to the session<br>
$_SESSION['user'] = 'Alice';</p>
<p>// Register a function to automatically write the session on shutdown<br>
session_register_shutdown(function() {<br>
// This callback will be automatically called when the script finishes<br>
session_write_close();<br>
});</p>
<p>// Simulate some long-running code afterward<br>
sleep(2);</p>
<p>// Close the session write and release the lock<br>
// This call is redundant here but ensures immediate closure<br>
// session_write_close();</p>
<p>// Time-consuming operations can continue without blocking other requests to the same session<br>
sleep(5);</p>
<p>// When the script ends, the registered shutdown function will automatically call session_write_close()</p>
<p>/**</p>
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<p>How it works:</p>
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<p>session_register_shutdown registers a callback automatically invoked at script shutdown.</p>
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<p>session_write_close closes the session, saves data, and releases the lock.</p>
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<p>Combined use avoids manually calling session_write_close multiple times,</p>
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<p>and guarantees session data is saved even if the script doesn't explicitly close the session early.</p>
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<p>Example use cases:</p>
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<p>E-commerce checkout process to ensure the user's shopping cart session data is fully saved.</p>
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<p>API long connection handling to prevent session lock from blocking other requests.</p>
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<p>Multi-step form submission to avoid concurrent session write conflicts.<br>
*/</p>
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<p data-is-last-node="" data-is-only-node=""><?php<br>
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echo "Example code ends";<br>
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