Question

Use str_replace in array_map

Asked by: joaochagas

Hi e's, usually I use str_replace for substitute special characters for a space ' ', and I use with a string, in this way:
======================================
$string = str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»','@','\"','[',']','<','>','+','%','º','ª'),' ',$string);
=======================================
Now I want use str_replace with array_map, because I have a array with a lot of keys, and I want substitute in all keys the special characters.

Regards, JC

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Asked On
2009-06-02 at 11:29:57ID24457623
Tags

str_replace

,

php

,

array_map

Topic

PHP Scripting Language

Participating Experts
2
Points
350
Comments
12

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Answers

 

by: cxrPosted on 2009-06-02 at 11:40:07ID: 24529979

Please be more specific about what kind of array you have and what results you want. Can you show an example?

 

by: jessegivyPosted on 2009-06-02 at 11:40:46ID: 24529991

This should do it::

$code = "str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»','@','\"','[',']','<','>','+','%','º','ª'),' ',$array_element)";
$list = array_map(create_function(&$array_element,$code),$list);

                                              
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by: joaochagasPosted on 2009-06-02 at 11:55:50ID: 24530147

@cxr, I have a array with many keys, and I want replace all special characters for ' '(space).
Usually I do with a string, but with a array I don't know how I do that.
I need to replace in all values of the array.
Example of a key:
[0] => the, great. Day)
return [0] => the great Day)

@jessegivy I try your solution in this way but don't work.
============================================
$regra = str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»','@','\"','[',']','<','>','+','%','º','ª'),' ',$hh1total[1]);
$list = array_map(create_function(&$hh1total[1],$regra),$list);
//$hh1total[1] contain:
Array
(
    [0] => tags relacionadas
    [1] => tags relacionadas
    [2] => bookmarks de jaspion
)


Regards, JC

 

by: joaochagasPosted on 2009-06-02 at 12:00:58ID: 24530206

In snippet code you can see my code, but don't work.

function substituir($subs)
{
return str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»','@','\"','[',']','<','>','+','%','º','ª'),' ',$subs);
}
 
$hh1total[1] = array_map('substituir',$hh1total[1]);

                                              
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by: jessegivyPosted on 2009-06-02 at 12:12:26ID: 24530327

Oh boy, just remembered you want to perform str_replace on the keys, so just flip the sucker before passing into array_map, then flip it back afterwards:

$code = "str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»','@','\"','[',']','<','>','+','%','º','ª'),' ',$array_element)";
$list = array_flip(array_map(create_function(&$array_element,$code),array_flip($list)));

                                              
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by: cxrPosted on 2009-06-02 at 12:20:54ID: 24530448

array_map() must have array parameters for each of the parameters that goes to str_replace(). Three parameters means three arrays. All of them must have the same number of parameters.

$keys = array('the, great. Day', 'Another Great! Day', '!!test!!', 'correct?');  # four items
$symbols = array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»',
                 '@','"','[',']','<','>','+','%','º','ª');
$sym_table = array($symbols,$symbols,$symbols,$symbols);  # four items
$spaces = array(' ',' ',' ',' ');  # four items
$res = array_map('str_replace',$sym_table,$spaces,$keys);  # run array_map()
var_dump($res);
 
# Because parameters 2 and 3 are the same for all invokations, a helper function is better:
function array_str_replace($param) {
  return str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»',
                 '@','"','[',']','<','>','+','%','º','ª'),' ',$param);
}
$keys = array('the, great. Day', 'Another Great! Day', '!!test!!', 'correct?');  # four items
$res = array_map('array_str_replace',$keys);
var_dump($res);

                                              
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by: jessegivyPosted on 2009-06-02 at 12:30:18ID: 24530554

Two questions:

1.  is $hh1total[1] an array?
2.  are you expecting that array map will modify the keys or values of the $hh1total[1] array?

 

by: joaochagasPosted on 2009-06-02 at 13:42:25ID: 24531349

@jessegivy,
is $hh1total[1] an array? yes.
are you expecting that array map will modify the keys or values of the $hh1total[1] array? yes.

Regards, JC

 

by: jessegivyPosted on 2009-06-02 at 14:08:36ID: 24531579

The way I understand it array_map operates on the values of the array, so if you want to call str_replace on the keys then you've got to array_flip before calling array_map per my example.  then flip the return value back so that the keys and values are correct.  lookup the array_flip function on php.net for more info if interested.

Cheers,

Jesse

 

by: jessegivyPosted on 2009-06-02 at 14:09:45ID: 24531588

@cxr, looks like he's only got the one array and he's only passing one argument to the callback function?

 

by: joaochagasPosted on 2009-06-02 at 14:17:37ID: 24531659

@cxr, I test your solution:
===============
# Because parameters 2 and 3 are the same for all invocations, a helper function is better:
function array_str_replace($param) {
  return str_replace(array('.',',',':','(',')','-','/','|','?','!','\'','*','&','«','»',
                 '@','"','[',']','<','>','+','%','º','ª'),' ',$param);
}
$keys = array('the, great. Day', 'Another Great! Day', '!!test!!', 'correct?');  # four items
$res = array_map('array_str_replace',$keys);
var_dump($res);
===================

In the first view the code work well, tell me just if that code is prepare to receive aleatory number of keys, because not is always four keys, sometimes is 1, other 5, other 20 and so one!

Regards, JC

 

by: cxrPosted on 2009-06-02 at 14:40:46ID: 24531838

The number of items in the array does not matter when you use the array_str_replace() helper function.

Jesse, the term "key" does not mean "array key" in this case... :)

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