strpos - and multiple needles?

**=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=** · Dec 28 '07, 02:15 PM

Re: strpos - and multiple needles?

jodleren wrote:

Hi!
>
I was reading php.net for a way to find a number of characters in a
strings. Say I want to look for a b and c ind $string.
As far as I could see, there is no function for that.

preg_match("[abc]",$subject) ;

You might find reading something on regular expressions useful.

Cheers,
--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

Proudly running Debian Linux with 2.6.22-3-amd64 kernel, KDE 3.5.8, and PHP
5.2.4-2 generating this signature.
Uptime: 14:37:42 up 36 days, 53 min, 4 users, load average: 0.40, 0.81,
0.94

**My Pet Programmer** · Dec 28 '07, 02:15 PM

Re: strpos - and multiple needles?

jodleren said:

Hi!
>
I was reading php.net for a way to find a number of characters in a
strings. Say I want to look for a b and c ind $string.
As far as I could see, there is no function for that.
>
So, I can either?
1) run through the string and test using in_array('a', 'b', 'c')
2) run through array and test using strpos( $items[$i]....
Where I find #2 the best.
>
But is there a function which can do that faster or in a better way?

So you have one string, and you want to see if each of your elements are
in it individually.

So:

$needles = array("a", "b", "c");
$haystack = "This is a string with a certain number of each character in
it.";

$counts = array();
function countChars($let ter, $key, $arr) {
global $output;
$garbage = explode($letter , $arr[0]);
$arr[1][$letter] = count($garbage)-1;

}
array_walk($nee dles, 'countChars', array($haystack , &$counts));

print_r($counts ); // Array ( [a] =6 [b] =1 [c] =4 )

That's a little cleaner, I suppose. You're still going through a bunch,
but if you're just counting, that will return an array that looks like that.

All the best,
~A!

--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

**My Pet Programmer** · Dec 28 '07, 02:25 PM

Re: strpos - and multiple needles?

Iván Sánchez Ortega said:

jodleren wrote:

[snip]

preg_match("[abc]",$subject) ;

Oh, see, that's much better than what I did.

You might find reading something on regular expressions useful.

And so, it seems, would I. Thanks!

~A!
--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

**My Pet Programmer** · Dec 28 '07, 02:45 PM

Re: strpos - and multiple needles?

Iván Sánchez Ortega said:

jodleren wrote:

>Hi!
>>
>I was reading php.net for a way to find a number of characters in a
>strings. Say I want to look for a b and c ind $string.
>As far as I could see, there is no function for that.

preg_match("[abc]",$subject) ;

You might find reading something on regular expressions useful.

Cheers,

That will only tell you if any of the characters are in the string. Do
you have one that will say whether all of them are in the haystack?

--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

**=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=** · Dec 28 '07, 02:45 PM

Re: strpos - and multiple needles?

My Pet Programmer wrote:

>>I was reading php.net for a way to find a number of characters in a
>>strings. Say I want to look for a b and c ind $string.
>>As far as I could see, there is no function for that.

>>
>preg_match("[abc]",$subject) ;

>
That will only tell you if any of the characters are in the string. Do
you have one that will say whether all of them are in the haystack?

Are you looking for http://php.net/count_chars ??

What are you trying to do, exactly?

--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

MSN:i_eat_s_p_a _m_for_breakfas t@hotmail.com
Jabber:ivansanc hez@jabber.org ; ivansanchez@kde talk.net

**My Pet Programmer** · Dec 28 '07, 02:55 PM

Re: strpos - and multiple needles?

Iván Sánchez Ortega said:

My Pet Programmer wrote:

>>>I was reading php.net for a way to find a number of characters in a
>>>strings. Say I want to look for a b and c ind $string.
>>>As far as I could see, there is no function for that.
>>preg_match( "[abc]",$subject) ;

>That will only tell you if any of the characters are in the string. Do
>you have one that will say whether all of them are in the haystack?

Are you looking for http://php.net/count_chars ??

What are you trying to do, exactly?

Oh, for me it was just idle curiosity. I'm not sure what the OP is after.

~A!

--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

**jodleren** · Dec 28 '07, 03:05 PM

Re: strpos - and multiple needles?

On Dec 28, 4:43 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

My Pet Programmer wrote:

>I was reading php.net for a way to find a number of characters in a
>strings. Say I want to look for a b and c ind $string.
>As far as I could see, there is no function for that.
preg_match("[abc]",$subject) ;

That will only tell you if any of the characters are in the string. Do
you have one that will say whether all of them are in the haystack?

Are you looking forhttp://php.net/count_chars??
What are you trying to do, exactly?

To check for invalid characters in a filename

WBR
Sonnich

**My Pet Programmer** · Dec 28 '07, 03:15 PM

Re: strpos - and multiple needles?

jodleren said:

On Dec 28, 4:43 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

>My Pet Programmer wrote:

>>>>I was reading php.net for a way to find a number of characters in a
>>>>strings. Say I want to look for a b and c ind $string.
>>>>As far as I could see, there is no function for that.
>>>preg_match ("[abc]",$subject) ;
>>That will only tell you if any of the characters are in the string. Do
>>you have one that will say whether all of them are in the haystack?

>Are you looking forhttp://php.net/count_chars??
>What are you trying to do, exactly?

To check for invalid characters in a filename

WBR
Sonnich

preg_match("*[abc]*", $haystack); worked for me.

~A!

--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

**=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=** · Dec 28 '07, 03:25 PM

Re: strpos - and multiple needles?

jodleren wrote:

To check for invalid characters in a filename

Escape the filename, then.

--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

MSN:i_eat_s_p_a _m_for_breakfas t@hotmail.com
Jabber:ivansanc hez@jabber.org ; ivansanchez@kde talk.net

**jodleren** · Dec 28 '07, 03:35 PM

Re: strpos - and multiple needles?

On Dec 28, 5:20 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

jodleren wrote:

To check for invalid characters in a filename

Escape the filename, then.

Sorry, I dont get this one.

**=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=** · Dec 28 '07, 03:45 PM

Re: strpos - and multiple needles?

jodleren wrote:

On Dec 28, 5:20 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

>jodleren wrote:

To check for invalid characters in a filename

>Escape the filename, then.

>
Sorry, I dont get this one.

OK... why do you need to check for invalid characters in a filename?

In other words, where could a filename with "strange" characters cause
damage to your system?

--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

La costumbre es una segunda naturaleza.- Galeno.

**jodleren** · Dec 28 '07, 04:15 PM

Re: strpos - and multiple needles?

On Dec 28, 5:41 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

jodleren wrote:

On Dec 28, 5:20 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

jodleren wrote:
To check for invalid characters in a filename
Escape the filename, then.

>

Sorry, I dont get this one.

>
OK... why do you need to check for invalid characters in a filename?
>
In other words, where could a filename with "strange" characters cause
damage to your system?

Windows based systems do not allow certain characters. I need to check
for them, _even_ that my server can handle them, I still have to think
of the user downloading a file etc....

**=?ISO-8859-15?Q?Iv=E1n_S=E1nchez_Ortega?=** · Dec 28 '07, 04:25 PM

Re: strpos - and multiple needles?

jodleren wrote:

Windows based systems do not allow certain characters. I need to check
for them, _even_ that my server can handle them, I still have to think
of the user downloading a file etc....

Then, you do not want to check for the positions of the invalid characters
(as you said on your original post).

You want to run a preg_match (to detect) or preg_replace (to fix) on the
filename string.

--
----------------------------------
Iván Sánchez Ortega -ivansanchez-algarroba-escomposlinux-punto-org-

Un ordenador no es un televisor ni un microondas, es una herramienta
compleja.

**My Pet Programmer** · Dec 28 '07, 04:35 PM

Re: strpos - and multiple needles?

jodleren said:

On Dec 28, 5:41 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
escomposlinux.-.punto.-.orgwrote:

>jodleren wrote:

>>On Dec 28, 5:20 pm, Iván Sánchez Ortega <ivansanchez-...@rroba-
>>escomposlinux .-.punto.-.orgwrote:
>>>jodleren wrote:
>>>>To check for invalid characters in a filename
>>>Escape the filename, then.
>>Sorry, I dont get this one.

>OK... why do you need to check for invalid characters in a filename?
>>
>In other words, where could a filename with "strange" characters cause
>damage to your system?

Windows based systems do not allow certain characters. I need to check
for them, _even_ that my server can handle them, I still have to think
of the user downloading a file etc....

Been there, definitely.

preg_match('/^([a-zA-Z]\:)(\\[^\\/:*?<>"|]*(?<![
]))*(\.[a-zA-Z]{2,6})$/', $filename);

That one should only match valid filenames.

~A!

--
Anthony Levensalor
anthony@mypetpr ogrammer.com

Only two things are infinite, the universe and human stupidity,
and I'm not sure about the former. - Albert Einstein

strpos - and multiple needles?

strpos - and multiple needles?

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment