Question

我有多个包含相同文本结构的文件。我现在正在尝试删除所有行，直到一行以特定单词开头。这是文件之一的一部分：

Test        Sampertant
ALL         5784
COMMENT     This files contains information about infomarxinc
COMMENT     Companie located in USA
FEATURES               Location/Qualifiers
     A               lines (7709..2170)
     3'try           complement(7676..7678)
                     /note="stop"
                     /label=STOP
     B               lines (7679..7708)
                     /note="stop"
                     /label=start
PAST
        1 talian and American multinational corporation and is the world’s 
       50 eighth largest auto maker.The group was established in late 2014

我只想保留PAST之后的行我已经编写了以下代码来做到这一点

$lines = file($newname);

# Loop through the array
foreach($lines as $line) { 

$seq = trim($line);

    # Find all lines starting with a number
    if (preg_match('/^\d/', $seq)){ 
        # Replace all number with | 
        $seq = preg_replace('/[0-9]+/', '', $seq);
        $seq = preg_replace('/\s/',"",$seq);

        # Store in string
        $out .= $seq;
    } 
### Read lines into file ###
    $f = fopen($newname, "w");
    fwrite($f, $out);
    fclose($f);
}

对于大多数文件，直到我得到此文件，它都可以工作。 PART之前的一行以3'try开始。在最终结果中，还添加了3'try，但我不希望这样做。 现在如何删除所有行，直到我的行以PAST行开头，然后执行我的代码以查找以数字开头的所有行。 要仅保留此文件的这些行：

 1 talian and American multinational corporation and is the world’s 
 50 eighth largest auto maker.The group was established in late 2014

Answer 1

您可以添加一些逻辑来首先找到“ PART”行，然后再写出编号的行：

...

$lines = file($newname);
$found = false;

// Loop through the array
foreach($lines as $line) { 

$seq = trim($line);

if( $seq == "PAST" )
    $found = true;

    // Find all lines starting with a number
    if ($found && preg_match('/^\d/', $seq)){ 
        # Replace all number with | 
        $seq = preg_replace('/[0-9]+/', '', $seq);
        $seq = preg_replace('/\s/',"",$seq);

        # Store in string
        $out .= $seq;
    } 
    // Read lines into file
    $f = fopen($newname, "w");
    fwrite($f, $out);
    fclose($f);
}

Answer 2

也许我遗漏了一些东西，但是以下应该起作用：

$raw = file_get_contents($filename);
if (! $raw) {
    echo 'no valid data';
    exit;
}
$cut = strpos($raw,'PAST');
if (! $cut) {
    echo 'PAST not found in file';
    exit;
}
echo substr($raw,$cut + 5);
exit;

您所说的所有文件都具有相同的结构：

$raw = file_get_contents($filename);
if (! $raw) {
    echo 'no valid data';
    exit;
}
$lines = explode("\n",$raw); // assume \n as the line return
$lines = array_splice($lines,13);
echo join("\n",$lines);
exit;

如何删除文件中的所有行，直到出现特定单词为止PHP

2 个答案: