PHP - String Snippets

Siehe auch

PHP - Zahlen formatieren

Überflüssige Whitespace entfernen

<?php
$str = 'foo   o';
$str = preg_replace('/\s\s+/', ' ', $str);
// This will be 'foo o' now
echo $str;
?>

Zeilenumbruch einfügen

string wordwrap ( string $str [, int $width = 75 [, string $break = "\n" [, bool $cut = false ]]] )

Zeilenenden normalisieren

	function normalize($s) {
	    // Normalize line endings using Global
	    // Convert all line-endings to UNIX format
	    $s = str_replace(CRLF, LF, $s);
	    $s = str_replace(CR, LF, $s);
	    // Don't allow out-of-control blank lines
	    $s = preg_replace("/\n{2,}/", LF . LF, $s);
	    return $s;
	}

Text kürzen

Text kürzen / HTML entfernen

function truncateText($text,$characters=500){
		$summary = strip_tags($text);
		if(strlen($summary) > $characters) {
			$summary = substr($summary, 0, $characters); // display no more than 500 chars
			$trimToSentence = substr($summary, 0, strrpos($summary, ". ")+1); // and truncate to last sentence
			if( strlen( $trimToSentence) > intval($characters/3) ) $summary = $trimToSentence; // use it if not too short
		}
		$summary = trim($summary);
		return $summary;
}

// Beispiel 2
function truncateText($text, $maxlength = 200) {
  // truncate to max length
  $text = substr(strip_tags($text), 0, $maxlength);
  // check if we've truncated to a spot that needs further truncation
  if(strlen(rtrim($text, ' .!?,;')) == $maxlength) {
    // truncate to last word 
    $text = substr($text, 0, strrpos($text, ' ')); 
  }
  return trim($text); 
}

Einsatz in Processwire:

$summary = truncateText($page->body); 
echo "
  <a href='$page->url'>$page->title</a>
  <p class='summary'>$summary</p>
  ";

Text kürzen HTML belassen

function truncateHtml($text, $length = 100) {
    $current_size = strlen($text);
    $diff = strlen($text);
    $remainder = $current_size - $length;
    while($diff > 0 AND $remainder > 0) {
        $pattern = "/(.*)[^<>](?=<)/s";
        $text = preg_replace($pattern, "$1", $text);
        $diff = $current_size - strlen($text);
        $current_size = strlen($text);
        $remainder = $current_size - $length;
    }
// iff $diff == 0 there are no more characters to remove
// iff $remainder == 0 there should removed no more characters
    return $text;
}

Auf Wortende kürzen

function limit_words($words, $limit, $append = ' …') {
  $limit = $limit+1;
  $words = explode(' ', $words, $limit+1);
  array_pop($words); // Shorten the array by 1 because that final element will be the sum of all the words after the limit
  $words = implode(' ', $words) . $append;
  return $words;
}

Auf Satzende kürzen

<?php

function substr_sentence($string, $start=0, $limit=10, $max_char = 600)
    {
    /* This functions cuts a long string in sentences.
    *
    * substr_sentence($string, $start, $limit);
    * $string = 'A example. By someone that loves PHP. Do you? We do!';
    * $start = 0; // we would start at the beginning
    * $limit = 10; // so, we get 10 sentences (not 10 words or characters!)
    *
    * It's not as substr()) in single characters.
    * It's not as substr_words() in single words.
    * 
    * No more broken lines in a story. The story/article must go on!
    *
    * Written by Eddy Erkelens "Zunflappie"
    * Published on www.mastercode.nl 
    * May be free used and adapted
    *
    */
    
    // list of sentences-ends. All sentences ends with one of these. For PHP, add the ;
    $end_characters = array(
                '. ', 
                '? ',
                '! '
                );
    
    // put $string in array $parts, necessary evil
    $parts = array($string);            
        
    // foreach interpunctation-mark we will do this loop
    foreach($end_characters as $end_character)
        {
        // go thru each part of the sentences we already have
        foreach($parts as $part)
            {
            // make array with the new sentences
            $sentences[] = explode($end_character, $part);
            }
        
        // unfortunately explode() removes the end character itself. So, place it back
        foreach($sentences as $sentence)
            {
            // some strange stuff
            foreach($sentence as $real_sentence)
                {
                // empty sentence we do not want
                if($real_sentence != '')
                    {
                    // if there is already an end-character, dont place another one
                    if(in_array(substr($real_sentence, -1, 1), $end_characters))
                        {
                        // store for next round
                        $next[] = trim($real_sentence);        
                        }
                    else
                        {
                        // store for next round and add the removed character
                        $next[] = trim($real_sentence).$end_character;    
                        }
                    }
                }
            }
            
        // store for next round
        $parts = $next;
        
        // unset the remaining and useless stuff
        unset($sentences, $sentence, $next);
        }    

	// check for max-char-length
	$total_chars = 0;
	$sentence_nr = 0;
	$sentences = array();
	
	// walk thru each member of $part
	foreach($parts as $part)
		{
		// count the string-lenght and add this to $total_chars
		$total_chars += strlen($part);
		
		// if $total-chars not already higher then max-char, add this sentences!
		if($total_chars < $max_char)
			{
			$sentences[] = $part;
			}
		}

    // return the shortened story as a string
    return implode(" ", array_slice($sentences, $start, $limit));
    }
?>

Telefonnummer für Telefonlink konvertieren (nur Zahlen)

// Extract phone number from a string
$telLink = '';
$tel = '07121 / 123-45';
$tel = preg_replace('/[^0-9]/', '', $tel);
$telLink = '<a href="tel:'.$telLink.'" class="button tel">Direkt anrufen</a>';

String als Variablenname

Manchmal möchte man einen String als Variable nutzen, damit PHP den Namen des Strings als Variable Nutzt kann man so arbeiten:

$string = 'meineVariable';
${$string} = Hallo;
echo($meineVariable) // Hallo

Führende Null / Leading Zero

Use sprintf :

sprintf('%08d', 1234567);

Alternatively you can also use str_pad:

str_pad($value, 8, '0', STR_PAD_LEFT); // does not work with negativ value

Zufällige Zeichenkette mit definierten Zeichen erstellen

$permitted_chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randString = substr(str_shuffle($permitted_chars), 0, 10);