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Web应用中采用以下代码进行文件类型过滤: <nobr aria-hidden="true">denyext=array(".php",".php4",".php3",".php2","php1",".phtml",".htaccess");</nobr><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>d</mi><mi>e</mi><mi>n</mi><msub><mi>y</mi><mi>e</mi></msub><mi>x</mi><mi>t</mi><mo>=</mo><mi>a</mi><mi>r</mi><mi>r</mi><mi>a</mi><mi>y</mi><mo stretchy="false">(</mo><mo>"</mo><mo>.</mo><mi>p</mi><mi>h</mi><mi>p</mi><mo>"</mo><mo>,</mo><mo>"</mo><mo>.</mo><mi>p</mi><mi>h</mi><mi>p</mi><mn>4</mn><mo>"</mo><mo>,</mo><mo>"</mo><mo>.</mo><mi>p</mi><mi>h</mi><mi>p</mi><mn>3</mn><mo>"</mo><mo>,</mo><mo>"</mo><mo>.</mo><mi>p</mi><mi>h</mi><mi>p</mi><mn>2</mn><mo>"</mo><mo>,</mo><mo>"</mo><mi>p</mi><mi>h</mi><mi>p</mi><mn>1</mn><mo>"</mo><mo>,</mo><mo>"</mo><mo>.</mo><mi>p</mi><mi>h</mi><mi>t</mi><mi>m</mi><mi>l</mi><mo>"</mo><mo>,</mo><mo>"</mo><mo>.</mo><mi>h</mi><mi>t</mi><mi>a</mi><mi>c</mi><mi>c</mi><mi>e</mi><mi>s</mi><mi>s</mi><mo>"</mo><mo stretchy="false">)</mo><mo>;</mo></math><script type="math/tex" id="MathJax-Element-10">deny_ext = array(".php",".php4",".php3",".php2","php1",".phtml",".htaccess"); </script>file_name = deldot(<nobr aria-hidden="true">filename);</nobr><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>f</mi><mi>i</mi><mi>l</mi><msub><mi>e</mi><mi>n</mi></msub><mi>a</mi><mi>m</mi><mi>e</mi><mo stretchy="false">)</mo><mo>;</mo></math><script type="math/tex" id="MathJax-Element-11">file_name); </script>file_ext = str_ireplace('::<nobr aria-hidden="true">DATA,′′,</nobr><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>D</mi><mi>A</mi><mi>T</mi><msup><mi>A</mi><mo>′</mo></msup><msup><mo>,</mo><mo>″</mo></msup><mo>,</mo></math><script type="math/tex" id="MathJax-Element-12">DATA', '', </script>file_ext); 下列描述中正确的是( )。