strpos(3) [php man page]

STRPOS(3)								 1								 STRPOS(3)

strpos - Find the position of the first occurrence of a substring in a string

SYNOPSIS

       mixed strpos (string  $haystack, mixed  $needle, [int  $offset])

DESCRIPTION

	Find the numeric position of the first occurrence of $needle in the $haystack string.

PARAMETERS

	      o $haystack
		- The string to search in.

	      o $needle
		- If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

	      o $offset
		- If specified, search will start this number of characters counted from the beginning of the string. Unlike strrpos(3) and strri-
		pos(3), the offset cannot be negative.

RETURN VALUES

	Returns the position of where the needle exists relative to the beginning of the $haystack string (independent of offset). Also note  that
       string positions start at 0, and not 1.

	Returns FALSE if the needle was not found.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

EXAMPLES

       Example #1

	      Using ===

	      <?php
	      $mystring = 'abc';
	      $findme	= 'a';
	      $pos = strpos($mystring, $findme);

	      // Note our use of ===.  Simply == would not work as expected
	      // because the position of 'a' was the 0th (first) character.
	      if ($pos === false) {
		  echo "The string '$findme' was not found in the string '$mystring'";
	      } else {
		  echo "The string '$findme' was found in the string '$mystring'";
		  echo " and exists at position $pos";
	      }
	      ?>

       Example #2

	      Using !==

	      <?php
	      $mystring = 'abc';
	      $findme	= 'a';
	      $pos = strpos($mystring, $findme);

	      // The !== operator can also be used.  Using != would not work as expected
	      // because the position of 'a' is 0. The statement (0 != false) evaluates
	      // to false.
	      if ($pos !== false) {
		   echo "The string '$findme' was found in the string '$mystring'";
		       echo " and exists at position $pos";
	      } else {
		   echo "The string '$findme' was not found in the string '$mystring'";
	      }
	      ?>

       Example #3

	      Using an offset

	      <?php
	      // We can search for the character, ignoring anything before the offset
	      $newstring = 'abcdef abcdef';
	      $pos = strpos($newstring, 'a', 1); // $pos = 7, not 0
	      ?>

NOTES

       Note

	      This function is binary-safe.

SEE ALSO

       stripos(3), strrpos(3), strripos(3), strstr(3), strpbrk(3), substr(3), preg_match(3).

PHP Documentation Group 														 STRPOS(3)

Check Out this Related Man Page

STRRPOS(3)								 1								STRRPOS(3)

strrpos - Find the position of the last occurrence of a substring in a string

SYNOPSIS

       int strrpos (string  $haystack, string  $needle, [int  $offset])

DESCRIPTION

	Find the numeric position of the last occurrence of $needle in the $haystack string.

PARAMETERS

	      o $haystack
		- The string to search in.

	      o $needle
		- If $needle is not a string, it is converted to an integer and applied as the ordinal value of a character.

	      o $offset
		-  If  specified,  search will start this number of characters counted from the beginning of the string. If the value is negative,
		search will instead start from that many characters from the end of the string, searching backwards.

RETURN VALUES

	Returns the position where the needle exists relative to the beginnning of the $haystack string (independent of search direction  or  off-
       set). Also note that string positions start at 0, and not 1.

	Returns FALSE if the needle was not found.

       Warning

	      This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on
	      Booleans for more information. Use the === operator for testing the return value of this function.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.0.0	|						    |
       |	|						    |
       |	|  The $needle may now be a string of more than one |
       |	| character.					    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      Checking if a needle is in the haystack

	       It  is  easy  to  mistake the return values for "character found at position 0" and "character not found". Here's how to detect the
	      difference:

	      <?php

	      $pos = strrpos($mystring, "b");
	      if ($pos === false) { // note: three equal signs
		  // not found...
	      }

	      ?>

       Example #2

	      Searching with offsets

	      <?php
	      $foo = "0123456789a123456789b123456789c";

	      var_dump(strrpos($foo, '7', -5));  // Starts looking backwards five positions
						 // from the end. Result: int(17)

	      var_dump(strrpos($foo, '7', 20));  // Starts searching 20 positions into the
						 // string. Result: int(27)

	      var_dump(strrpos($foo, '7', 28));  // Result: bool(false)
	      ?>

SEE ALSO

       strpos(3), stripos(3), strripos(3), strrchr(3), substr(3).

PHP Documentation Group 														STRRPOS(3)

Linux and UNIX Man Pages

strpos(3) [php man page]

Check Out this Related Man Page