PHP，从包含特定单词的大字符串中删除所有行

Question

$file = file_get_contents("http://www.bigsite.com"); 

我怎么能去掉字符串$file中包含单词“hello”的所有行？

Answer 1

$file = file_get_contents("http://www.example.com"); 

// remove sigle word hello 
echo preg_replace('/(hello)/im', '', $file); 

// remove multiple words hello, foo, bar, foobar 
echo preg_replace('/(hello|foo|bar|foobar)/im', '', $file); 

编辑删除线

// read each file lines in array 
$lines = file('http://example.com/'); 

// match single word hello 
$pattern = '/(hello)/im'; 

// match multiple words hello, foo, bar, foobar 
$pattern = '/(hello|foo|bar|foobar)/im'; 

$rows = array(); 

foreach ($lines as $key => $value) { 
    if (!preg_match($pattern, $value)) { 
     // lines not containing hello 
     $rows[] = $line; 
    } 
} 

// now create the paragraph again 
echo implode("\n", $rows); 

Answer 2

$file = file_get_contents("http://www.bigsite.com"); 
$lines = explode("\n", $file); 
$exclude = array(); 
foreach ($lines as $line) { 
    if (strpos($line, 'hello') !== FALSE) { 
     continue; 
    } 
    $exclude[] = $line; 
} 
echo implode("\n", $exclude); 

Answer 3

在这里你去：

$file = file('http://www.bigsite.com'); 

foreach($file as $key=>$line) { 
    if(false !== strpos($line, 'hello')) { 
    unset $file[$key]; 
    } 
} 

$file = implode("\n", $file);