Unfortunatelly this sequence is not a perfect if-then-else replacement. It works as expected in situations like:
But consider this:
Ouch :-) Allthough the first expression ist true, both the "then" and the "else" part of the sequence is executed, because the "then" part evaluates to false.
Ok heres the situation,
We use Solaris 8 at work with Sybase for the db. I need to be able to easily create visual diagrams of some of our more complex systems. I've been using Visio which is such a manual process and takes a while.
I was thinking maybe using Visio somehow in conjunction... (0 Replies)
We have a unix file that contains special characters (ie. Ñ, °, É, ¿ , £ , ø ). When I try to read this file I get a codepage error and the characters are replaced by the # symbol. How do I keep the special characters from being read?
Thanks.
Ryan (3 Replies)
Hi,
I am writing a Perl script that reads in many lines, if a line meets the criteria I want to edit, it. For example, the script will return the following example line... test=abc123
All I want to do is strip off the "test=" and just be left with the abc123. In my script I can easily... (3 Replies)
All I'm trying to split a string at the $ into arrays
@data:=<dataFile>
a $3.33
b $4.44
dfg $0.56
The split command I have been playing with is:
split(/\$/, @data)
which results with
a .33 b .44 dfg .56
any help with this is appreciated
/r
Rick (9 Replies)
Hi,
I have field in a file which would come with any special character, how do i check that field?
Eg: @123TYtaasa>>>/ 131dfetr_~2
In the above example, how do I add pattern for any special character on the keyboard.
Thanks (3 Replies)
Hi all
i have been trying to do a small 'question and answer' script using if-else statement and a combination of pipe. I have succeeded in allowing the user to login with user name and password stored in a sequence username/password in a file named "pass" like this:
echo "please enter your... (14 Replies)
Hi, I'm looking for information about UNIX Special Files. I must write an essay connected with this topic, and I hope you'll tell me where can I found trusty information about it, because Google doesn't really help me. I'll be grateful for answer. (3 Replies)
I have a file that has the name in one of the lines as MARíA MENDOZA in Windows. When this gets FTPed over to UNIX it appears as MAR�A MENDOZA. Is there anyway to overcome this? Its causing a issue because the file is Postional and fields are getting pushed by 2 digits..
Any help would be... (4 Replies)
Any time I do :
ls *.txt > mytext.txt
I get something like this in the output file:
^
Tue Jan 22 16:19:19 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
t1Fam_BrOv :~>alias | grep ls
alias l.='ls -d .* --color=tty'
alias lR='ls -R'
alias la='ls -Al'
alias lc='ls -ltcr'
alias ldd='ls -ltr |... (5 Replies)
Discussion started by: genehunter
5 Replies
LEARN ABOUT PHP
substr
SUBSTR(3) 1 SUBSTR(3)substr - Return part of a stringSYNOPSIS
string substr (string $string, int $start, [int $length])
DESCRIPTION
Returns the portion of $string specified by the $start and $length parameters.
PARAMETERS
o $string
- The input string. Must be one character or longer.
o $start
- If $start is non-negative, the returned string will start at the $start'th position in $string, counting from zero. For
instance, in the string ' abcdef', the character at position 0 is ' a', the character at position 2 is ' c', and so forth. If
$start is negative, the returned string will start at the $start'th character from the end of $string. If $string is less than or
equal to $start characters long, FALSE will be returned.
Example #1
Using a negative $start
<?php
$rest = substr("abcdef", -1); // returns "f"
$rest = substr("abcdef", -2); // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
o $length
- If $length is given and is positive, the string returned will contain at most $length characters beginning from $start (depend-
ing on the length of $string). If $length is given and is negative, then that many characters will be omitted from the end of
$string (after the start position has been calculated when a $start is negative). If $start denotes the position of this trunca-
tion or beyond, false will be returned. If $length is given and is 0, FALSE or NULL, an empty string will be returned. If
$length is omitted, the substring starting from $start until the end of the string will be returned.
Example #2
Using a negative $length
<?php
$rest = substr("abcdef", 0, -1); // returns "abcde"
$rest = substr("abcdef", 2, -1); // returns "cde"
$rest = substr("abcdef", 4, -4); // returns false
$rest = substr("abcdef", -3, -1); // returns "de"
?>
RETURN VALUES
Returns the extracted part of $string; or FALSE on failure, or an empty string.
CHANGELOG
+--------------+---------------------------------------------------+
| Version | |
| | |
| | Description |
| | |
+--------------+---------------------------------------------------+
|5.2.2 - 5.2.6 | |
| | |
| | If the $start parameter indicates the position |
| | of a negative truncation or beyond, false is |
| | returned. Other versions get the string from |
| | start. |
| | |
+--------------+---------------------------------------------------+
EXAMPLES
Example #3
Basic substr(3) usage
<?php
echo substr('abcdef', 1); // bcdef
echo substr('abcdef', 1, 3); // bcd
echo substr('abcdef', 0, 4); // abcd
echo substr('abcdef', 0, 8); // abcdef
echo substr('abcdef', -1, 1); // f
// Accessing single characters in a string
// can also be achieved using "square brackets"
$string = 'abcdef';
echo $string[0]; // a
echo $string[3]; // d
echo $string[strlen($string)-1]; // f
?>
Example #4
substr(3) casting behaviour
<?php
class apple {
public function __toString() {
return "green";
}
}
echo "1) ".var_export(substr("pear", 0, 2), true).PHP_EOL;
echo "2) ".var_export(substr(54321, 0, 2), true).PHP_EOL;
echo "3) ".var_export(substr(new apple(), 0, 2), true).PHP_EOL;
echo "4) ".var_export(substr(true, 0, 1), true).PHP_EOL;
echo "5) ".var_export(substr(false, 0, 1), true).PHP_EOL;
echo "6) ".var_export(substr("", 0, 1), true).PHP_EOL;
echo "7) ".var_export(substr(1.2e3, 0, 4), true).PHP_EOL;
?>
The above example will output:
1) 'pe'
2) '54'
3) 'gr'
4) '1'
5) false
6) false
7) '1200'
ERRORS /EXCEPTIONS
Returns FALSE on error.
Example #5
<?php
var_dump(substr('a', 1)); // bool(false)
?>
SEE ALSO strrchr(3), substr_replace(3), preg_match(3), trim(3), mb_substr(3), wordwrap(3), String access and modification by character.
PHP Documentation Group SUBSTR(3)