The note about the $ was just generally.
In your code, you test the variable var to match the reg exp. Since var is not defined, it can never match. So the command inside the curly brackets (print) will never be executed.
In my example you could for further use store the length into a variable like this:
Hello Everybody,
Does anyone know what the @ symbol means in a csh script, if used with a variable assignment as below
@ line = 1
why not just use....
set line=1
Many thanks
rkap (1 Reply)
Hi,
I am having a problem with assigning a value to a variable. The empname is looked for in the employees file and I am trying to assign it to the jobnum variable in the following statement
jobnum= cat/etc/employees | grep $empname | cut -d : -f 5
It is getting the right answer but it is... (3 Replies)
Hi,
i have an issue with eval and variable assignment.
1) i have a date value in a variable and that date is part of a filename,
var1=20100331
file1=${var1}-D1-0092.xml.zip
file2=${var2}-D2-0092.xml.zip
file3=${var3}-D3-0092.xml.zip
i am passing the above variables to a script via... (11 Replies)
Hi
I have variable A_B=alpha
also var1="A"
var2="B"
I want to retrieve the value alpha using var1 and var2 , somthing like
echo ${${var1}_${var2}} that works. Obviously this is receiving syntax
error (6 Replies)
Hi all,
I’m very new to UNIX programming. I have a question on dynamic variable
1. I’m having delimited file (only one row). First of all, I want to count number of columns based on delimiter. Then I want to create number of variables equal to number of fields.
Say number of... (5 Replies)
Hi,
In AIX I have a variable with , (coma) separated values assigned to it like shown below
var1=apple,boy,chris
i want to convert this to
var1='apple','boy','chris'
the number of values assigned to var1 might change and it could be from 1 to n
any suggestions please? (3 Replies)
pattern1=book
{
x=1
eval echo \$pattern$x
}
book (this is the output)
But when I assign a variable to the output of the eval it doesn't work unless I prefix 2 times backslash before $ as shown below.
{
a=`eval echo \\$pattern$x`
echo $a
}
book
Why here twice "\" has to be... (3 Replies)
My Code :
--------------------------------------------
#!/bin/bash
for i in `echo server1 server2`
do
eval ${i}_name = "apache"
echo ${i}_name
done
--------------------------------------------
Current output :
>./test.sh
./test.sh: line 5: server1_name: command not found... (3 Replies)
Hi
I have a strange problem:
In my shell script I am performing a copy task:
. prop.txt
cp -r $dir/ $dir/archive
$dir is fetched from a property file (prop.txt) which stores its value
dir=/opt/data
Now the problem is another dir1 comes into picture. I only want to add... (1 Reply)
Hi
I am facing a problem.
export local_folder=/opt/app/
cd /opt/app/abc/
abcversion="abc*" (abcga5 is inside /opt/app/abc/)
echo $abcversion (it echoes the correct version as abcga5 )
Now when I reuse the value of abcversion for a below path:
export... (6 Replies)
Discussion started by: ankur328
6 Replies
LEARN ABOUT PHP
is_scalar
IS_SCALAR(3) 1 IS_SCALAR(3)is_scalar - Finds whether a variable is a scalarSYNOPSIS
bool is_scalar (mixed $var)
DESCRIPTION
Finds whether the given variable is a scalar.
Scalar variables are those containing an integer, float, string or boolean. Types array, object and resource are not scalar.
Note
is_scalar(3) does not consider resource type values to be scalar as resources are abstract datatypes which are currently based on
integers. This implementation detail should not be relied upon, as it may change.
Note
is_scalar(3) does not consider NULL to be scalar.
PARAMETERS
o $var
- The variable being evaluated.
RETURN VALUES
Returns TRUE if $var is a scalar, FALSE otherwise.
EXAMPLES
Example #1
is_scalar(3) example
<?php
function show_var($var)
{
if (is_scalar($var)) {
echo $var;
} else {
var_dump($var);
}
}
$pi = 3.1416;
$proteins = array("hemoglobin", "cytochrome c oxidase", "ferredoxin");
show_var($pi);
show_var($proteins)
?>
The above example will output:
3.1416
array(3) {
[0]=>
string(10) "hemoglobin"
[1]=>
string(20) "cytochrome c oxidase"
[2]=>
string(10) "ferredoxin"
}
SEE ALSO is_float(3), is_int(3), is_numeric(3), is_real(3), is_string(3), is_bool(3), is_object(3), is_array(3).
PHP Documentation Group IS_SCALAR(3)