ctype_digit(3) [php man page]

CTYPE_DIGIT(3)								 1							    CTYPE_DIGIT(3)

ctype_digit - Check for numeric character(s)

SYNOPSIS

       bool ctype_digit (string  $text)

DESCRIPTION

	Checks if all of the characters in the provided string, $text, are numerical.

PARAMETERS

	      o $text
		- The tested string.

RETURN VALUES

	Returns TRUE if every character in the string $text is a decimal digit, FALSE otherwise.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.1.0	|						    |
       |	|						    |
       |	|  Before  PHP	5.1.0,	this function returned TRUE |
       |	| when $text was an empty string.		    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      A ctype_digit(3) example

	      <?php
	      $strings = array('1820.20', '10002', 'wsl!12');
	      foreach ($strings as $testcase) {
		  if (ctype_digit($testcase)) {
		      echo "The string $testcase consists of all digits.
";
		  } else {
		      echo "The string $testcase does not consist of all digits.
";
		  }
	      }
	      ?>

	      The above example will output:

	      The string 1820.20 does not consist of all digits.
	      The string 10002 consists of all digits.
	      The string wsl!12 does not consist of all digits.

       Example #2

	      A ctype_digit(3) example comparing strings with integers

	      <?php

	      $numeric_string = '42';
	      $integer	      = 42;

	      ctype_digit($numeric_string);  // true
	      ctype_digit($integer);	     // false (ASCII 42 is the * character)

	      is_numeric($numeric_string);   // true
	      is_numeric($integer);	     // true
	      ?>

NOTES

       Note

	       This function expects a string to be useful, so for example passing in an integer may not return the expected result. However, also
	      note that HTML forms will result in numeric strings and not integers. See also the types section of the manual.

       Note

	       If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative val-
	      ues have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string  contain-
	      ing the decimal digits of the integer.

SEE ALSO

       ctype_alnum(3), ctype_xdigit(3), is_numeric(3), is_int(3), is_string(3).

PHP Documentation Group 													    CTYPE_DIGIT(3)

Tcl_GetInt(3)						      Tcl Library Procedures						     Tcl_GetInt(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tcl_GetInt, Tcl_GetDouble, Tcl_GetBoolean - convert from string to integer, double, or boolean

SYNOPSIS

       #include <tcl.h>

       int
       Tcl_GetInt(interp, string, intPtr)

       int
       Tcl_GetDouble(interp, string, doublePtr)

       int
       Tcl_GetBoolean(interp, string, boolPtr)

ARGUMENTS

       Tcl_Interp   *interp	 (in)	   Interpreter to use for error reporting.

       CONST char   *string	 (in)	   Textual value to be converted.

       int	    *intPtr	 (out)	   Points to place to store integer value converted from string.

       double	    *doublePtr	 (out)	   Points to place to store double-precision floating-point value converted from string.

       int	    *boolPtr	 (out)	   Points to place to store boolean value (0 or 1) converted from string.
_________________________________________________________________

DESCRIPTION

       These  procedures  convert  from  strings  to integers or double-precision floating-point values or booleans (represented as 0- or 1-valued
       integers).  Each of the procedures takes a string argument, converts it to an internal form of a particular type, and stores the  converted
       value  at  the  location  indicated by the procedure's third argument.  If all goes well, each of the procedures returns TCL_OK.  If string
       doesn't have the proper syntax for the desired type then TCL_ERROR is returned, an error message is left in the interpreter's  result,  and
       nothing is stored at *intPtr or *doublePtr or *boolPtr.

       Tcl_GetInt  expects  string to consist of a collection of integer digits, optionally signed and optionally preceded by white space.  If the
       first two characters of string are ``0x'' then string is expected to be in hexadecimal form;  otherwise, if the first character	of  string
       is ``0'' then string is expected to be in octal form;  otherwise, string is expected to be in decimal form.

       Tcl_GetDouble  expects  string  to  consist  of	a floating-point number, which is:  white space;  a sign; a sequence of digits;  a decimal
       point;  a sequence of digits;  the letter ``e'';  and a signed decimal exponent.  Any of the fields may be omitted, except that the  digits
       either before or after the decimal point must be present and if the ``e'' is present then it must be followed by the exponent number.

       Tcl_GetBoolean  expects	string	to  specify  a boolean value.  If string is any of 0, false, no, or off, then Tcl_GetBoolean stores a zero
       value at *boolPtr.  If string is any of 1, true, yes, or on, then 1 is stored at *boolPtr.  Any of these values	may  be  abbreviated,  and
       upper-case spellings are also acceptable.

KEYWORDS

       boolean, conversion, double, floating-point, integer

Tcl																     Tcl_GetInt(3)