PHP之如何将数组变量写入文件?
在用PHP记录日志,或者是 Ajax 请求出错想要 debug 的时候。我们一般都会将信息写入到一个指定的文件
当中。然后根据相应的信息来处理问题。
比如笔者最喜欢在用 Ajax 取不到数据的时候,在PHP脚本里面加上下面一段代码
$fp = fopen('./a.txt', 'a+b');
fwrite($fp, $content);
fclose($fp);
但是,这里有一个问题。那就是 $content 是一个数组怎么办?
你可能会说,我循环输出。那要是多维数组呢?
我只是为了 debug 用得着搞得那么累吗。
这里你可以使用 var_export() .
此函数返回关于传递给该函数的变量的结构信息,它和 var_dump() 类似,不同的是
其返回的表示是合法的 PHP 代码。
可以通过将函数的第二个参数设置为 TRUE,从而返回变量的表示。
$fp = fopen('./a.txt', 'a+b');
fwrite($fp, var_export($content, true));
fclose($fp);
注意 var_export() 的第二个参数需要设置为 true 才表示取得返回值。要不然是直接输出
另外,如果你的 $content 只是一个数组,而不包含其他的内容的话
你也可以用 print_r()
同样的,print_r() 的第二个参数也要设置为 true
$fp = fopen('./a.txt', 'a+b');
fwrite($fp, print_r($content, true));
fclose($fp);

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