Php: Remove unnecessary blank lines

? Php $ striamabooknnnnnmoth; remove all null and linefeed echopreg_replace ([s] {2 ,}, $ str ). br; Remove unnecessary null and line breaks and retain only one echopreg_replace ([s] {2,}), \ 1, $ str ); remove unnecessary null or line feed $ textpreg_replace (rn | n | r | t) I ,,

? Php $ str = iamabook \ n \ nmoth; // remove all null and linefeed echopreg_replace (/[\ s] {2 ,}/,, $ str ). 'br '; // remove unnecessary null and line breaks and retain only one echopreg_replace (/([\ s] {2,})/, \ 1, $ str ); // remove unnecessary null or wrap $ text = preg_replace (/(\ r \ n | \ r | \ t)/I ,'',

$ Str = "I am a book \ n \ nmoth ";
// Remove all spaces and line breaks
Echo preg_replace ("/[\ s] {2,}/", "", $ str ).'
';
// Remove unnecessary spaces and line breaks and retain only one

Echo preg_replace ("/([\ s] {2,})/", "\ 1", $ str );

// Remove unnecessary spaces or line breaks $ text = preg_replace ("/(\ r \ n | \ r | \ t)/I ",'', $ text );

$ LastSeveralLineContentsArr = preg_replace ("/([| \ t] {0,} [\ n] {1,}) {2,}/", "", $ lastSeveralLineContentsArr ); // filter out consecutive blank rows or tabs in Html for regular expressions>

?>