PHP/String/Sub string

Substring count

   <source lang="html4strict">

<?php

  $buzzwords = array("ex", "te", "xt");

$talk = <<< talk Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text Text talk;

  foreach($buzzwords as $bw) {
     echo "The word $bw appears ".substr_count($talk,$bw)." time(s).
";
  }

?>

      </source>
   
  

Substring replace

   <source lang="html4strict">

<?php

  $ccnumber = "1234567899991111";
  echo substr_replace($ccnumber,"************",0,12);

?>

      </source>
   
  

substr($string, 3)

   <source lang="html4strict">

<? $alphabet_test = "abcdefghijklmnop"; print("3: " . substr($alphabet_test, 3)); ?>

      </source>
   
  

substr($String, 3, 5)

   <source lang="html4strict">

<? $alphabet_test = "abcdefghijklmnop"; print("3, 5: " . substr($alphabet_test, 3, 5)); ?>

      </source>
   
  

substr($String, (2)

   <source lang="html4strict">

<? $alphabet_test = "abcdefghijklmnop"; print("-3, 5: " . substr($alphabet_test, -3, 5)); ?>

      </source>
   
  

substr($String, -3, -5) (3)

   <source lang="html4strict">

<? $alphabet_test = "abcdefghijklmnop"; print("-3, -5: " . substr($alphabet_test, -3, -5)); ?>

      </source>
   
  

substr($String, 3, -5) (4)

   <source lang="html4strict">

<? $alphabet_test = "abcdefghijklmnop"; print("3, -5: " . substr($alphabet_test, 3, -5)); ?>

      </source>