Organizing common string processing code snippets in PHP

Organizing common string processing code snippets in PHP_PHP Tutorial

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Release： 2016-07-21 15:23:52

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Remove HTML tags

Copy code The code is as follows:

$text = strip_tags($input, "") ;

The above function mainly uses strip_tags, please refer to the specific usage instructions.
Return the text between $start and $end

Copy code The code is as follows:

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

Convert url to link

Copy code The code is as follows:

$url = "Jean-Baptiste Jung (http://www.jb51.net)";
$url = preg_replace("#http://([A-z0-9./-]+)#", '$0< /a>', $url);

Split the string into 140 characters

Copy code The code is as follows:

 
function split_to_chunks($to,$text){ 
$total_length = (140 - strlen($to)); 
$text_arr = explode(" ",$text); 
$i=0; 
$message[0]=""; 
foreach ($text_arr as $word){ 
if ( strlen($message[$i] . $word . ' ' ) <= $total_length ){ 
if ($text_arr[count($text_arr)-1] == $word){ 
$message[$i] .= $word; 
} else { 
$message[$i] .= $word . ' '; 
} 
} else { 
$i++; 
if ($text_arr[count($text_arr)-1] = = $word){ 
$message[$i] = $word; 
} else { 
$message[$i] = $word . ' '; 
} 
} 
} 
return $message; 
} 

Delete the URL in the string

Copy code The code is as follows :

 
$string = preg_replace('/b(https?|ftp|file)://[-A-Z0-9+&@#/%?=~_|$!: ,.;]*[A-Z0-9+&@#/%=~_|$]/i', '', $string); 

Convert the string to SEO friendly String of

Copy code The code is as follows:

 
function slug($str){ 
$str = strtolower( trim($str)); 
$str = preg_replace('/[^a-z0-9-]/', '-', $str); 
$str = preg_replace('/-+/ ', "-", $str); 
return $str; 
} 

Parsing CSV files

Copy code The code is as follows:

 
$fh = fopen("contacts.csv", "r"); 
while($line = fgetcsv($fh, 1000, ",") ) { 
echo "Contact: {$line[1]}"; 
} 

　String search

Copy code The code is as follows:

 
function contains($str, $content, $ignorecase=true){ 
if ($ignorecase){ 
$str = strtolower($str ); 
$content = strtolower($content); 
} 
return strpos($content,$str) ? true : false; 
} 

　 Check characters Whether the string starts with a certain string

Copy code The code is as follows:

 
function String_Begins_With($needle, $haystack { 
return (substr($haystack, 0, strlen($needle))==$needle); 
} 

　Extract email address from string

Copy code The code is as follows:

function extract_emails($str){
// This regular expression extracts all emails from a string:
$ regexp = '/([a-z0-9_.-])+@(([a-z0-9-])+.)+([a-z0-9]{2,4})+/i' ;
preg_match_all($regexp, $str, $m);

return isset($m[0]) ? $m[0] : array();
}

$test_string = 'This is a test string...

test1@example.org

Test different formats:
test2@example.org;
foobar

strange formats:
test5@example.org
test6[at ]example.org
test7@example.net.org.com
test8@ example.org
test9@!foo!.org

foobar
';

print_r(extract_emails($test_string));