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PHP之如何将数组变量写入文件?

Jun 13, 2016 am 10:54 AM
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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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