Question

我从我用preg_replace清理过的文件中提取数据。问题是它只返回$output一次，即使文档中有多个$content。

我需要使用循环但是我不知道如何让它工作。我尝试使用此link中的此代码，但无法使其在echo $output方面正常运行。

这是我的代码：

<?php

$getme = file_get_contents("somefile.txt");

$string = preg_replace('/[^A-Za-z\-]/', '', $getme);

function get_between($content,$start,$end){
$r = explode($start, $content);
if (isset($r[1])){
    $r = explode($end, $r[1]);
    return $r[0];
}
return '';
}

$content = $string;
$start = "somestuff";
$end = "morestuff";
$output = get_between($content,$start,$end);


echo $output;
?>

任何帮助都将不胜感激。

Answer 1

使用此代码执行此操作：

<?php

$getme = file_get_contents("somefile.txt");

$string = preg_replace('/[^A-Za-z\-]/', '', $getme);

function get_between($valuestr,$start,$end){

if (isset($valuestr)){
    $r = explode($end, $valuestr);
    return $r;
}

return '';
}

$content = $string;
$start = "somestuff";
$end = "morestuff";

//Explode all of input contents :
$r = explode($start, $content);

// Loop check function
foreach ($r as $valuestr) {
    $output .= get_between($valuestr,$start,$end);
}

echo $output;
?>

Answer 2

试试这个。你没有使用循环。我认为没有循环就无法检索多个值。

$getme = file_get_contents("somefile.txt");
$string = preg_replace('/[^A-Za-z\-]/', '', $getme);
function get_between($content,$start,$end){
    $retval='';
    $r = explode($start, $content);
    foreach($r as $s){
        if (isset($s)){
            $t = explode($end, $s);
            $retval .=$t[0].'<br>';
        }
    }
    return $retval;
 }
 $content = $string;
 $start = "somestuff";
 $end = "morestuff";
 $output = get_between($content,$start,$end);
 echo $output;

Answer 3

我能够自己解决它：

<?php

$getme = file_get_contents("somefile.txt");

$string = preg_replace('/[^A-Za-z\-]/', '', $getme);

preg_match_all("/somestuff(.*?)morestuff/", $string, $matches, PREG_SET_ORDER);

foreach ($matches as $val) {
echo str_replace(array('somestuff', 'morestuff'), array('', ','), $val[0]);
}

?>

无法循环输出多次

3 个答案: