PCLOSE関数を使用するときに標準のエラー出力をキャプチャして正しく処理する方法は？実践的なスキルを共有します

gitbox 2025-09-12

3。標準エラー出力を個別にキャプチャする方法

標準出力と標準エラー出力を個別に取得する場合は、一時ファイルまたは名前付きパイプを使用できます。

ソリューション1：一時ファイルストレージ標準エラーを使用します

<span><span><span class="hljs-variable">$stderrFile</span></span><span> = </span><span><span class="hljs-title function_ invoke__">tempnam</span></span><span>(</span><span><span class="hljs-title function_ invoke__">sys_get_temp_dir</span></span><span>(), </span><span><span class="hljs-string">'stderr'</span></span><span>);
</span><span><span class="hljs-variable">$cmd</span></span><span> = </span><span><span class="hljs-string">"ls /nonexistent 2&gt; <span class="hljs-subst">$stderrFile</span></span></span><span>";

</span><span><span class="hljs-variable">$handle</span></span><span> = </span><span><span class="hljs-title function_ invoke__">popen</span></span><span>(</span><span><span class="hljs-variable">$cmd</span></span><span>, </span><span><span class="hljs-string">"r"</span></span><span>);
</span><span><span class="hljs-variable">$output</span></span><span> = </span><span><span class="hljs-string">''</span></span><span>;
</span><span><span class="hljs-keyword">while</span></span><span> (!</span><span><span class="hljs-title function_ invoke__">feof</span></span><span>(</span><span><span class="hljs-variable">$handle</span></span><span>)) {
    </span><span><span class="hljs-variable">$output</span></span><span> .= </span><span><span class="hljs-title function_ invoke__">fread</span></span><span>(</span><span><span class="hljs-variable">$handle</span></span><span>, </span><span><span class="hljs-number">1024</span></span><span>);
}
</span><span><span class="hljs-variable">$status</span></span><span> = </span><span><span class="hljs-title function_ invoke__">pclose</span></span><span>(</span><span><span class="hljs-variable">$handle</span></span><span>);

</span><span><span class="hljs-variable">$stderr</span></span><span> = </span><span><span class="hljs-title function_ invoke__">file_get_contents</span></span><span>(</span><span><span class="hljs-variable">$stderrFile</span></span><span>);
</span><span><span class="hljs-title function_ invoke__">unlink</span></span><span>(</span><span><span class="hljs-variable">$stderrFile</span></span><span>);

</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"標準出力:\n<span class="hljs-subst">$output</span></span></span><span>\n";
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"標準誤差:\n<span class="hljs-subst">$stderr</span></span></span><span>\n";
</span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"コマンドはステータスを返します: <span class="hljs-subst">$status</span></span></span><span>\n";
</span></span>

このようにして、より詳細なエラー処理のために2つの出力ストリームを個別に取得できます。

4. proc_openを使用して、より柔軟なパイプライン制御を取得します

proc_open（）を使用すると、標準入力、出力、エラーを直接操作できるようになり、使用がより複雑になりますが、より強力になります。

 <span><span><span class="hljs-variable">$descriptorspec</span></span><span> = [
    </span><span><span class="hljs-number">0</span></span><span> =&gt; [</span><span><span class="hljs-string">"pipe"</span></span><span>, </span><span><span class="hljs-string">"r"</span></span><span>],  </span><span><span class="hljs-comment">// 標準入力</span></span><span>
    </span><span><span class="hljs-number">1</span></span><span> =&gt; [</span><span><span class="hljs-string">"pipe"</span></span><span>, </span><span><span class="hljs-string">"w"</span></span><span>],  </span><span><span class="hljs-comment">// 標準出力</span></span><span>
    </span><span><span class="hljs-number">2</span></span><span> =&gt; [</span><span><span class="hljs-string">"pipe"</span></span><span>, </span><span><span class="hljs-string">"w"</span></span><span>]   </span><span><span class="hljs-comment">// 標準誤差</span></span><span>
];

</span><span><span class="hljs-variable">$process</span></span><span> = </span><span><span class="hljs-title function_ invoke__">proc_open</span></span><span>(</span><span><span class="hljs-string">'ls /nonexistent'</span></span><span>, </span><span><span class="hljs-variable">$descriptorspec</span></span><span>, </span><span><span class="hljs-variable">$pipes</span></span><span>);

</span><span><span class="hljs-keyword">if</span></span><span> (</span><span><span class="hljs-title function_ invoke__">is_resource</span></span><span>(</span><span><span class="hljs-variable">$process</span></span><span>)) {
    </span><span><span class="hljs-title function_ invoke__">fclose</span></span><span>(</span><span><span class="hljs-variable">$pipes</span></span><span>[</span><span><span class="hljs-number">0</span></span><span>]);

    </span><span><span class="hljs-variable">$stdout</span></span><span> = </span><span><span class="hljs-title function_ invoke__">stream_get_contents</span></span><span>(</span><span><span class="hljs-variable">$pipes</span></span><span>[</span><span><span class="hljs-number">1</span></span><span>]);
    </span><span><span class="hljs-title function_ invoke__">fclose</span></span><span>(</span><span><span class="hljs-variable">$pipes</span></span><span>[</span><span><span class="hljs-number">1</span></span><span>]);

    </span><span><span class="hljs-variable">$stderr</span></span><span> = </span><span><span class="hljs-title function_ invoke__">stream_get_contents</span></span><span>(</span><span><span class="hljs-variable">$pipes</span></span><span>[</span><span><span class="hljs-number">2</span></span><span>]);
    </span><span><span class="hljs-title function_ invoke__">fclose</span></span><span>(</span><span><span class="hljs-variable">$pipes</span></span><span>[</span><span><span class="hljs-number">2</span></span><span>]);

    </span><span><span class="hljs-variable">$status</span></span><span> = </span><span><span class="hljs-title function_ invoke__">proc_close</span></span><span>(</span><span><span class="hljs-variable">$process</span></span><span>);

    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"標準出力:\n<span class="hljs-subst">$stdout</span></span></span><span>\n";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"標準誤差:\n<span class="hljs-subst">$stderr</span></span></span><span>\n";
    </span><span><span class="hljs-keyword">echo</span></span><span> </span><span><span class="hljs-string">"コマンドはステータスを返します: <span class="hljs-subst">$status</span></span></span><span>\n";
}
</span></span>

この方法は、複雑なニーズにより適した2つの出力ストリームを正確に分離できます。