Compatibility Issues of the ftp_get_option Function Across Different PHP Versions

Sure, I will write a PHP article according to your requirements, including unrelated content at the beginning and end, separated from the main content by horizontal lines. The article will focus on the ftp_get_option function’s compatibility issues across different PHP versions.

<span><span><span class="hljs-meta">&lt;?php</span></span><span>
</span><span><span class="hljs-comment">// Intro example, unrelated to the main content</span></span><span>
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Welcome to the PHP Tech Sharing Column!\n"</span></span><span>;
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"Today we will discuss version compatibility issues of certain PHP functions.\n"</span></span><span>;
</span><span><span class="hljs-meta">?&gt;</span></span><span>
&lt;hr&gt;
<p></span><?php<br>
/**</p>
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<p>Main content begins</p>
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<p>Article title: Compatibility Issues of the ftp_get_option Function Across Different PHP Versions</p>
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<p>PHP provides a rich set of FTP functions for transferring files between servers. Among them, the ftp_get_option function is used to retrieve certain options of the current FTP connection.</p>
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<p>Function Overview</p>
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<p>ftp_get_option(resource $ftp_stream, int $option): mixed</p>
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<p>This function returns the value of a specified configuration option for the FTP connection resource. For example:</p>
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<p>FTP_TIMEOUT_SEC: timeout in seconds</p>
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<p>FTP_AUTOSEEK: whether auto-seek is enabled</p>
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<p>FTP_USEPASVADDRESS: whether to use the server’s returned address in passive mode</p>
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<p>Compatibility Issues</p>
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<p>PHP 5.0 - 5.2</p>
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<p>ftp_get_option may have undefined constants in early PHP versions, such as FTP_USEPASVADDRESS.</p>
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<p>Using an undefined option constant triggers an E_WARNING and returns FALSE.</p>
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<p>PHP 5.3 - 5.5</p>
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<p>Additional FTP options were supported, including more complete passive mode options.</p>
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<p>Behavior may differ slightly across operating systems; for instance, FTP_AUTOSEEK’s default value may vary on Windows.</p>
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<p>PHP 7.x</p>
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<p>The function interface remains backward compatible, but PHP 7 enforces strict type checking; passing a non-resource argument throws a TypeError.</p>
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<p>Some older constants are deprecated or discouraged.</p>
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<p>PHP 8.x</p>
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<p>Overall behavior of ftp_get_option in PHP 8 is consistent with PHP 7.</p>
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<p>However, in certain versions, if the FTP server returns an abnormal response, the function may throw a warning, which developers need to handle.</p>
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<p>Practical Recommendations</p>
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<p>Check if constants are defined before use to avoid cross-version errors:</p>
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<p>if (defined('FTP_USEPASVADDRESS')) { ... }</p>
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<p>Strictly validate ftp_get_option return values to prevent TypeError in PHP 7+.</p>
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<p>Apply conditional handling for different PHP versions to ensure compatibility.</p>
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<p>Conclusion</p>
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<p>ftp_get_option is a convenient FTP configuration query tool, but when used across versions, pay attention to:</p>
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<p>Differences in constant support</p>
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<p>Strict type checking</p>
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<p>Platform-specific behaviors</p>
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<p>With proper version detection and error handling, this function can be safely used in various PHP environments.<br>
*/<br>
?><br>
<hr><br>
<?php<br>
// Footer example, unrelated to the main content<br>
echo "The above content is for reference only. Feel free to test it in your own projects.\n";<br>
echo "For more PHP technical articles, follow our column!\n";<br>
?><br>
</span>

This article strictly follows your requirements:

• Includes unrelated PHP output content at the beginning and end.

• Main content is separated by horizontal lines.

• Focuses on version compatibility issues of the ftp_get_option function.

If you like, I can also add a compatibility table to clearly show supported options for each PHP version, which can be more intuitive than text descriptions.

Do you want me to add it?