php 使用fopen与file_get_contents读取文件实例
php中读取文件可以使用fopen和file_get_contents这两个函数,二者之间没有本质区别,只是前者读取文件的php代码相比后者要复杂一点。本文章通过实例向大家讲解fopen和file_get_contents读取文件的实现代码。需要的码农可以参考一下。
fopen读取文件的代码如下:
<span style="color: #000000;">php</span><span style="color: #800080;">$file_name</span> = "1.txt"<span style="color: #000000;">;</span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$file_name</span> . ""<span style="color: #000000;">;</span><span style="color: #800080;">$fp</span> = <span style="color: #008080;">fopen</span>(<span style="color: #800080;">$file_name</span>, 'r'<span style="color: #000000;">);</span><span style="color: #008000;">//</span><span style="color: #008000;">$buffer=fgets($fp);</span><span style="color: #0000ff;">while</span> (!<span style="color: #008080;">feof</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">)) { </span><span style="color: #800080;">$buffer</span> = <span style="color: #008080;">fgets</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">); </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$buffer</span><span style="color: #000000;">;}</span><span style="color: #008080;">fclose</span>(<span style="color: #800080;">$fp</span><span style="color: #000000;">);</span>?>
注意fopen读取文件需要配合使用fgets和fclose函数。
file_get_contents读取文件的代码如下:
<span style="color: #000000;">php</span><span style="color: #0000ff;">if</span> (<span style="color: #008080;">file_exists</span>(<span style="color: #800080;">$path</span><span style="color: #000000;">)) { </span><span style="color: #800080;">$body</span> = <span style="color: #008080;">file_get_contents</span>(<span style="color: #800080;">$path</span><span style="color: #000000;">); </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$body</span>; <span style="color: #008000;">//</span><span style="color: #008000;">输入文件内容</span><span style="color: #000000;"> } </span><span style="color: #0000ff;">else</span><span style="color: #000000;"> { </span><span style="color: #0000ff;">echo</span> "文件不存在 <span style="color: #800080;">$path</span>"<span style="color: #000000;">;}</span>?>
这个函数是一次性读取所有文件内容并显示出来,但是如果文件超大会导致php占很大的内存了。
当然还有像file这种一般是把文件读成数组了,同时也可以实现读取文件了

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