Question

我有txt文件，我需要循环回显特定数据。

假设我的txt文件名为：myfile.txt

内部结构如下：

etc="Orange" src="stack1"
etc="Blue" src="stack2"
etc="Green" src="stack3"
etc="Red" src="stack4"

如何在PHP中回显这些值：橙色，蓝色，绿色，红色？

Answer 1

您可以使用preg_match_all：

<?php
    # get your text
    $txt = file_get_contents('your_text_file.txt');

    # match against etc="" (gets val inside the quotes)
    preg_match_all('/etc="([^"]+)"/', $txt, $matches);

    # actual values = $matches[1]
    $values = $matches[1];

    echo '<pre>'. print_r($values, 1) .'</pre>';

Answer 2

$content = file_get_content("/path/to/myfile.txt", "r");
if (false === $content) {
  // handle error if file can't be open or find
}

preg_match_all('/etc="(.*?)"/', $content, $matches);

echo implode($matches[1], ',');

使用file_get_content可以检索文件中的内容。
之后，您需要检查file_get_content是否返回了错误代码（在这种情况下为false）。
preg_match_all将使用RegExp筛选出您所需的内容。特别是：

/ #is a delimiter needed 
etc=" #will match literally the letters etc="  
(.*?) #is a capturing group needed to collect all the values inside the "" part of etc value. So, capturing group is done with (). .* will match every character and ? make the quantifier "non greedy".
/ #is the ending delimiter

所有匹配项都收集在$matches数组内（不必事先定义$matches。

最后，您需要将收集的值转换为字符串，并可以使用implode函数。

Answer 3

我在代码//comments上全部检查。


<?php

$fichero = file_get_contents('./myfile.txt', false);

if($fichero === false){ //if file_get_contents() return false, the file isn't found, if its found, return data.
    echo "Can't find file.\n";
}else{ //If file is find, this condition is executed.
    $output = array(); //this variable is who will get the output of regular expression pattern from next line function.
    preg_match_all('/([A-Z])\w+/',$fichero, $output);
    for($i = 0; $i < count($output[0]); $i++){ //Iterate throught the first array inside of array of $output, count(array) is for get length of array.

        echo $output[0][$i]; //Print values from array $output[0][$i]
        if($i + 1 != count($output[0])){ //if not equal to length of array, add , at end of printed value of output[0][$i]
            echo ', ';
        }else{ //if equal to length of array, add . at end of printed value of $output[0][$i]
            echo '.';
        }

    }
}

?>

从txt文件获取特定数据

3 个答案: