Hi all,
Here is my situation.
I have a text file TXT_FILE like this:
john 123456
jack 94589
kelvin 94595
mary 88585
I want to read the first word in each line ( the name ) and assign to a string variable ( EX_LIST ) in my script so that I can use later as this commandfor i in... (6 Replies)
i am new user of unix.i have a question.My script is-
export STR_ALFA=`head -2 "${FILE_PATH}"|tail -1|cut -d"," -f1`
"${TEST_HOME}"/function/chk_alfa.ksh STR_ALFA
now i want to check STR_ALFA:
1)whether is alphabetic
2)whether is numeric
3)whether is alphanumeric... (1 Reply)
i am new user of unix.i have a question.My script is-
export STR_ALFA=`head -2 "${FILE_PATH}"|tail -1|cut -d"," -f1`
"${TEST_HOME}"/function/chk_alfa.ksh STR_ALFA
now i want to check STR_ALFA:
1)whether is alphabetic
2)whether is numeric
3)whether is alphanumeric... (1 Reply)
Hi,
I wish to find all lines that contain a specific search word, and then do few string operations on that line. The idea is to "fix" the file which has been moved from windows to unix.
Using unix - Sun Solaris
Test input ("t2.sas")
statement1
statement2
libname yahoo ... (6 Replies)
Hello,
I'm trying to get the configuration-IP-Addresses from Cisco-configurations
on the Routers they are defined as a Loopback0-interface like this:
interface Loopback0
ip address 172.23.19.249 255.255.255.255
On the Switches they are defined as a VLAN 80 interface like this
... (4 Replies)
I have a txt file with several columns and i want to peform an operation on two columns and output it to a new txt file .
file.txt
900.00000 1 1 1
500.00000
500.00000
100000.000
4
4
1.45257346E-07 899.10834 ... (4 Replies)
I have a file that contains RewriteRules for 200 countries (2 examples for 1 country below):
RewriteRule ^/at(/|/index.html|)$ http://%{HTTP_HOST}/locate/index.html?locale=de_AT
#&
RewriteRule ^/at_english(/|/index.html|)$ http://%{HTTP_HOST}/locate/index.html?locale=en_AT
I have... (5 Replies)
Hi, to everybody
i have a string which Looks like this
FT47;3;1;1;;;1;09.02.2017 21:21:19;2;2
and i would like to change to value on one Position only
e.g. the values on Position 6 should change to 1 nevertheyless which values was there before
AIX 4.3.2.0 and csh
i try... (10 Replies)
Hi to everybody
i stuck on a simple thing i had a string and i want cut it , i try already few thing with the cut command but does not the way it should.
The script is in csh and running on AIX 4.3.2.0
here are few samples how the string can look like
FT71;1;1;1;;;1;31.01.2017... (9 Replies)
Discussion started by: Nadielosabra
9 Replies
LEARN ABOUT PHP
empty
EMPTY(3) 1 EMPTY(3)empty - Determine whether a variable is emptySYNOPSIS
bool empty (mixed $var)
DESCRIPTION
Determine whether a variable is considered to be empty. A variable is considered empty if it does not exist or if its value equals FALSE.
empty(3) does not generate a warning if the variable does not exist.
PARAMETERS
o $var
- Variable to be checked
Note
Prior to PHP 5.5, empty(3) only supports variables; anything else will result in a parse error. In other words, the follow-
ing will not work: empty(trim($name)). Instead, use trim($name) == false.
No warning is generated if the variable does not exist. That means empty(3) is essentially the concise equivalent to !isset($var)
|| $var == false.
RETURN VALUES
Returns FALSE if $var exists and has a non-empty, non-zero value. Otherwise returns TRUE.
The following things are considered to be empty:
o "" (an empty string)
o 0 (0 as an integer)
o 0.0 (0 as a float)
o "0" (0 as a string)
o NULL
o FALSE
o array() (an empty array)
o $var; (a variable declared, but without a value)
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.5.0 | |
| | |
| | empty(3) now supports expressions, rather than |
| | only variables. |
| | |
| 5.4.0 | |
| | |
| | Checking non-numeric offsets of strings returns |
| | TRUE. |
| | |
+--------+---------------------------------------------------+
EXAMPLES
Example #1
A simple empty(3) / isset(3) comparison.
<?php
$var = 0;
// Evaluates to true because $var is empty
if (empty($var)) {
echo '$var is either 0, empty, or not set at all';
}
// Evaluates as true because $var is set
if (isset($var)) {
echo '$var is set even though it is empty';
}
?>
Example #2
empty(3) on String Offsets
PHP 5.4 changes how empty(3) behaves when passed string offsets.
<?php
$expected_array_got_string = 'somestring';
var_dump(empty($expected_array_got_string['some_key']));
var_dump(empty($expected_array_got_string[0]));
var_dump(empty($expected_array_got_string['0']));
var_dump(empty($expected_array_got_string[0.5]));
var_dump(empty($expected_array_got_string['0.5']));
var_dump(empty($expected_array_got_string['0 Mostel']));
?>
Output of the above example in PHP 5.3:
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
bool(false)
Output of the above example in PHP 5.4:
bool(true)
bool(false)
bool(false)
bool(false)
bool(true)
bool(true)
NOTES
Note
Because this is a language construct and not a function, it cannot be called using variable functions.
Note
When using empty(3) on inaccessible object properties, the __isset() overloading method will be called, if declared.
SEE ALSO isset(3), __isset(), unset(3), array_key_exists(3), count(3), strlen(3), The type comparison tables.
PHP Documentation Group EMPTY(3)