is_scalar(3) [php man page]

IS_SCALAR(3)								 1							      IS_SCALAR(3)

is_scalar - Finds whether a variable is a scalar

SYNOPSIS

       bool is_scalar (mixed  $var)

DESCRIPTION

	Finds whether the given variable is a scalar.

	Scalar variables are those containing an integer, float, string or boolean. Types array, object and resource are not scalar.

       Note

	      is_scalar(3)  does  not  consider resource type values to be scalar as resources are abstract datatypes which are currently based on
	      integers. This implementation detail should not be relied upon, as it may change.

       Note

	      is_scalar(3) does not consider NULL to be scalar.

PARAMETERS

	      o $var
		- The variable being evaluated.

RETURN VALUES

	Returns TRUE if $var is a scalar, FALSE otherwise.

EXAMPLES

       Example #1

	      is_scalar(3) example

	      <?php
	      function show_var($var)
	      {
		  if (is_scalar($var)) {
		      echo $var;
		  } else {
		      var_dump($var);
		  }
	      }
	      $pi = 3.1416;
	      $proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");

	      show_var($pi);
	      show_var($proteins)

	      ?>

	      The above example will output:

	      3.1416
	      array(3) {
		[0]=>
		string(10) "hemoglobin"
		[1]=>
		string(20) "cytochrome c oxidase"
		[2]=>
		string(10) "ferredoxin"
	      }

SEE ALSO

       is_float(3), is_int(3), is_numeric(3), is_real(3), is_string(3), is_bool(3), is_object(3), is_array(3).

PHP Documentation Group 													      IS_SCALAR(3)

SUBSTR_REPLACE(3)							 1							 SUBSTR_REPLACE(3)

substr_replace - Replace text within a portion of a string

SYNOPSIS

       mixed substr_replace (mixed  $string, mixed  $replacement, mixed  $start, [mixed  $length])

DESCRIPTION

       substr_replace(3) replaces a copy of $string delimited by the $start and (optionally) $length parameters with the string given in $replace-
       ment.

PARAMETERS

	      o $string
		- The input string.  An array of strings can be provided, in which case the replacements will occur on each  string  in  turn.	In
		this  case,  the  $replacement,  $start and $length parameters may be provided either as scalar values to be applied to each input
		string in turn, or as arrays, in which case the corresponding array element will be used for each input string.

	      o $replacement
		- The replacement string.

	      o $start
		- If $start is positive, the replacing will begin at the $start'th offset into $string.  If $start is negative, the replacing will
		begin at the $start'th character from the end of $string.

	      o $length
		- If given and is positive, it represents the length of the portion of $string which is to be replaced. If it is negative, it rep-
		resents the number of characters from the end of $string at which to stop replacing. If it is not given, then it will  default	to
		strlen(  $string  );  i.e. end the replacing at the end of $string. Of course, if $length is zero then this function will have the
		effect of inserting $replacement into $string at the given $start offset.

RETURN VALUES

	The result string is returned. If $string is an array then array is returned.

EXAMPLES

       Example #1

	      Simple substr_replace(3) examples

	      <?php
	      $var = 'ABCDEFGH:/MNRPQR/';
	      echo "Original: $var<hr />
";

	      /* These two examples replace all of $var with 'bob'. */
	      echo substr_replace($var, 'bob', 0) . "<br />
";
	      echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />
";

	      /* Insert 'bob' right at the beginning of $var. */
	      echo substr_replace($var, 'bob', 0, 0) . "<br />
";

	      /* These next two replace 'MNRPQR' in $var with 'bob'. */
	      echo substr_replace($var, 'bob', 10, -1) . "<br />
";
	      echo substr_replace($var, 'bob', -7, -1) . "<br />
";

	      /* Delete 'MNRPQR' from $var. */
	      echo substr_replace($var, '', 10, -1) . "<br />
";
	      ?>

       Example #2

	       Using substr_replace(3) to replace multiple strings at once

	      <?php
	      $input = array('A: XXX', 'B: XXX', 'C: XXX');

	      // A simple case: replace XXX in each string with YYY.
	      echo implode('; ', substr_replace($input, 'YYY', 3, 3))."
";

	      // A more complicated case where each replacement is different.
	      $replace = array('AAA', 'BBB', 'CCC');
	      echo implode('; ', substr_replace($input, $replace, 3, 3))."
";

	      // Replace a different number of characters each time.
	      $length = array(1, 2, 3);
	      echo implode('; ', substr_replace($input, $replace, 3, $length))."
";
	      ?>

	      The above example will output:

	      A: YYY; B: YYY; C: YYY
	      A: AAA; B: BBB; C: CCC
	      A: AAAXX; B: BBBX; C: CCC

NOTES

       Note

	      This function is binary-safe.

SEE ALSO

       str_replace(3), substr(3), String access and modification by character.

PHP Documentation Group 													 SUBSTR_REPLACE(3)