w3resource

PHP: sha1() function

Description

The sha1() function is used to calculate the sha1 hash of a string.

Version:

(PHP 4 and above)

Syntax:

sha1(string1, raw_output)

Parameter:

Name Description Required /
Optional
Type
string1 The input string. Required String
raw_output If TRUE sets raw 20 characters binary format. If FALSE (default) sets raw 40 character hex number format. Optional Boolean

Return value:

Returns the sha1 hash as a string.

Value Type: String.

Example:

<?php
$str = 'Good Morning';
echo sha1($str).'<br>';
echo sha1($str,TRUE).'<br>';
?>

Output:

06e336231466d0b0573a05cbca7813444afb5b29
ã6#fаW:ËÊxDJû[)

View the example in the browser

See also

PHP Function Reference

Previous: sha1_file
Next: similar_text



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PHP: Tips of the Day

Getting all defined constants

To get all defined constants including those created by PHP use the get_defined_constants function:

Example:

<?php
$constants = get_defined_constants();
var_dump($constants); // pretty large list

Output:

array(2250) {
  ["E_ERROR"]=>
  int(1)
  ["E_RECOVERABLE_ERROR"]=>
  int(4096)
  ["E_WARNING"]=>
  .....
  .....
  resource(1) of type (stream)
  ["STDOUT"]=>
  resource(2) of type (stream)
  ["STDERR"]=>
  resource(3) of type (stream)
}

To get only those constants that were defined by your app call the function at the beginning and at the end of your script (normally after the bootstrap process):

<?php
$constants = get_defined_constants();
define("HELLO", "hello");
define("WORLD", "world");
$new_constants = get_defined_constants();
$myconstants = array_diff_assoc($new_constants, $constants);
var_export($myconstants);

Output:

array (
  'HELLO' => 'hello',
  'WORLD' => 'world',
)

It's sometimes useful for debugging

 





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