?php
$a=" just wait ";
echo "Before trimming string length=".strlen($a)."<br>";
echo trim($a)."<br>";
echo "After trimming string length=".strlen($a);
?>
String length is same after trim a string. please help to me.
I tried number of times but not getting the correct output
You are not setting the value of $a when you trim it. See below
<?php
$a=" just wait ";
echo "Before trimming string length=".strlen($a)."<br>";
$a = trim($a)."<br>";
echo "After trimming string length=".strlen($a);
?>
Related
I wanted to assign variable name separated by comma based on user input using function.
I will get the user input using below script and it will call function for variable assignment
while [ "$ans" != "q" ]
do
clear
echo "Choose your subject"
echo "Press q once done"
echo " 1.Science"
echo " 2.Maths"
echo " 3.English"
...
read ans
case $ans in
1) clear
Science;;
2) clear
Maths;;
3) clear
English;;
....
esac
done
clear
subjects=""
Science()
{
subjects+="$subjects Science"
}
Maths()
{
subjects+="$subjects Maths"
}
English()
{
subjects+="$subjects English"
}
At the end I wanted to have variable subjects to have option choose by the user:
Etc:
Science,Maths
Maths,English
Science,English
English
In bash, the function definition must be placed before any calls to the function.
The line subjects="" must be placed before the while loop. Otherwise its value will get lost (will be set to empty string) on exit from the loop.
The += operator causes double concatenation in the line subjects+="$subjects Science", since the right hand side contains already the expansion of the subjects variable. Either subjects="$subjects Science", or subjects+=" Science" must have been used (the same is also true for other lines in which the += operator is used). Besides, since a comma separated list is desired, a , character must be used while concatenating strings instead of space character. For example: subjects="$subjects,Science"
So a corrected script could be like this:
#!/bin/bash
subjects=""
Science() {
subjects="$subjects,Science"
}
Maths() {
subjects="$subjects,Maths"
}
English() {
subjects="$subjects,English"
}
while [ "$ans" != "q" ]; do
clear
echo "Choose your subject"
echo "Press q once done"
echo " 1.Science"
echo " 2.Maths"
echo " 3.English"
read -r ans
case $ans in
1) Science;;
2) Maths;;
3) English;;
esac
done
subjects=${subjects:1} # to remove the leading ',' character
echo "Your selections are $subjects"
Note: I wouldn't normally use a function just to append a simple string to a variable.
When concatenating mysql regex character classes in php they disappear from the resulting string i.e.:
$regexp_arr = array('(word1)', '(word2)');
$value = 'word3';
$regexp_str = implode('[[:space:]]', $regexp_arr);
$v1 = '[[:<:]](' . $value . ')';
echo $regexp_str;
// gives
'(word1)(word2)';
// instead of
'(word1)[[:space:]](word2)'
echo $v1;
// gives
'(word3)'
//instead of
'[[:<:]](word3)'
I've tried with double quotation marks ", the result still the same.
Is there a special way to concatenate this in php? Why are the '[[:char_class:]]' getting stripped?
server php version is 5.6.36
In MODX, [[ and ]] are special characters used to indicate they are tags MODX needs to process. Even when you echo or retrieve it from the database, MODX will process them when rendering.
For debugging, you can follow-up your echo with an exit().
echo $regexp_str;
exit();
That short-circuits MODX and gives you the actual value of the string including the square brackets.
If you want the value to be visible in a MODX-rendered resource or template, then you'll have to replace them with their html entities first:
$regexp_str = str_replace(['[',']'], ['[', ']'], $regexp_str);
I'm a few weeks into bash scripting and I haven't advanced enough yet to get my head wrapped around this problem. Any help would be appreciated!
I have a "script.conf" file that contains the following:
key1=value1
key2=${HOME}/Folder
key3=( "k3v1" "k3 v2" "k3v3")
key4=( "k4v1"
"k4 v2"
"k4v3"
)
key5=value5
#key6="Do Not Include Me"
In a bash script, I want to read the contents of this script.conf file into an array. I've learned how to handle the scenarios for keys 1, 2, 3, and 5, but the key4 scenario throws a wrench into it with it spanning across multiple lines.
I've been exploring the use of sed -n '/=\s*[(]/,/[)]/{/' which does capture key4 and its value, but I can't figure out how to mix this so that the other keys are also captured in the matches. The range syntax is also new to me, so I haven't figured out how to separate the key/value. I feel like there is an easy regex that would accomplish what I want... in plain-text: "find and group the pattern ^(.*)= (for the key), then group everything after the '=' char until another ^(.*)= match is found, rinse and repeat". I guess if I do this, I need to change the while read line to not handle the key/value separation for me (I'll be looking into this while I'm waiting for a response). BTW, I think a solution where the value of key4 is flattened (new lines removed) would be acceptable; I know for key3 I have to store the value as a string and then convert it to an array later when I want to iterate over it since an array element apparently can't contain a list.
Am I on the right path with sed or is this a job for awk or some other tool? (I haven't ventured into awk yet). Is there an easier approach that I'm missing because I'm too deep into the forest (like changing the while read line in the LoadConfigFile function)?
Here is the code that I have so far in script.sh for processing and capturing the other pairs into the $config array:
__AppDir=$(dirname $0)
__AppName=${__ScriptName%.*}
typeset -A config #init config array
config=( #Setting Default Config values
[key1]="defaultValue1"
[key2]="${HOME}/defaultFolder"
[QuietMode]=0
[Verbose]=0 #Ex. Usage: [[ "${config[Verbose]}" -gt 0 ]] && echo ">>>Debug print"
)
function LoadConfigFile() {
local cfgFile="${1}"
shopt -s extglob #Needed to remove trailing spaces
if [ -f ${cfgFile} ]; then
while IFS='=' read -r key value; do
if [[ "${key:0:1}" == "#" ]]; then
#echo "Skipping Comment line: ${key}"
elif [ "${key:-EMPTY}" != "EMPTY" ]; then
value="${value%%\#*}" # Delete in-line, right comments
value="${value%%*( )}" # Delete trailing spaces
value="${value%%( )*}" # Delete leading spaces
#value="${value%\"*}" # Delete opening string quotes
#value="${value#\"*}" # Delete closing string quotes
#Manipulate any variables included in the value so that they can be expanded correctly
# - value must be stored in the format: "${var1}". `backticks`, "$var2", and "doubleQuotes" are left as is
value="${value//\"/\\\"}" # Escape double quotes for eval
value="${value//\`/\\\`}" # Escape backticks for eval
value="${value//\$/\\\$}" # Escape ALL '$' for eval
value="${value//\\\${/\${}" # Undo the protection of '$' if it was followed by a '{'
value=$(eval "printf '%s\n' \"${value}\"")
config[${key}]=${value} #Store the value into the config array at the specified key
echo " >>>DBG: Key = ${key}, Value = ${value}"
#else
# echo "Skipped Empty Key"
fi
done < "${cfgFile}"
fi
}
CONFIG_FILE=${__AppDir}/${__AppName}.conf
echo "Config File # ${CONFIG_FILE}"
LoadConfigFile ${CONFIG_FILE}
#Print elements of $config
echo "Script Config Values:"
echo "----------------------------"
for key in "${!config[#]}"; do #The '!' char gets an array of the keys, without it, we would get an array of the values
printf " %-20s = %s\n" "${key}" "${config[${key}]}"
done
echo "------ End Script Config ------"
#To convert to an array...
declare -a valAsArray=${config[RequiredAppPackages]} #Convert the value from a string to an array
echo "Count = ${#valAsArray[#]}"
for itemCfg in "${valAsArray[#]}"; do
echo " item = ${itemCfg}"
done
As I mentioned before, I'm just starting to learn bash and Linux scripting in general, so if you see that I'm doing some taboo things in other areas of my code too, please feel free to provide feedback in the comments... I don't want to start bad habits early on :-).
*If it matters, the OS is Ubuntu 14.04.
EDIT:
As requested, after reading the script.conf file, I would like for the elements in $config[#] to be equivalent to the following:
typeset -A config #init config array
config=(
[key1]="value1"
[key2]="${HOME}/Folder"
[key3]="( \"k3v1\" \"k3 v2\" \"k3v3\" )"
[key4]="( \"k4v1\" \"k4 v2\" \"k4v3\" )"
[key5]="value5"
)
I want to be able to convert the values of elements 'key4' and 'key3' into an array and iterated over them the same way in the following code:
declare -a keyValAsArray=${config[keyN]} #Convert the value from a string to an array
echo "Count = ${#keyValAsArray[#]}"
for item in "${keyValAsArray[#]}"; do
echo " item = ${item}"
done
I don't think it matters if \n is preserved for key4's value or not... that depends on if declare has a problem with it.
A shell is an environment from which to call tools with a language to sequence those calls. It is NOT a tool to manipulate text. The standard UNIX tool to manipulate text is awk. Trying to manipulate text in shell IS a bad habit, see why-is-using-a-shell-loop-to-process-text-considered-bad-practice for SOME of the reasons why
You still didn't post the expected result of populating the config array so I'm not sure but I think this is what you wanted:
$ cat tst.sh
declare -A config="( $(awk '
{ gsub(/^[[:space:]]+|([[:space:]]+|#.*)$/,"") }
!NF { next }
/^[^="]+=/ {
name = gensub(/=.*/,"",1)
value = gensub(/^[^=]+=/,"",1)
n2v[name] = value
next
}
{ n2v[name] = n2v[name] OFS $0 }
END {
for (name in n2v) {
value = gensub(/"/,"\\\\&","g",n2v[name])
printf "[%s]=\"%s\"\n", name, value
}
}
' script.conf
) )"
declare -p config
$ ./tst.sh
declare -A config='([key5]="value5" [key4]="( \"k4v1\" \"k4 v2\" \"k4v3\" )" [key3]="( \"k3v1\" \"k3 v2\" \"k3v3\")" [key2]="/home/Ed/Folder" [key1]="value1" )'
The above uses GNU awk for gensub(), with other awks you'd use [g]sub() instead.
I'm trying to trim only the left half of a string that is given to ltrim() as an argument. This is my current code.
ltrim()
{
string=${1}
divider=$((${#string} / 2))
trimrule=${2}
string_left=${string:0:$divider}
string_right=${string:$divider}
echo ${string:$divider} ## My own quick debug lines
echo ${string:0:$divider} ## My own quick debug lines
if [ $# -ne 2 ]
then
printf "%d argument(s) entered. 2 required.\n" "$#"
else
while :
do
case $string_left in
${2}*) string_left=${string_left#?} ;;
*${2}) string_left=${string_left%?} ;;
*) break ;;
esac
done
printf "Left side string is %s\n" "${string_left}"
fi
}
However, when I enter ltrim abcdefghijklmnopq abc the shell returns the following:
ijklmnopq
abcdefgh
Left side string is bcdefgh
So I only lost 'a' out of the word while I'm looking to get 'defgh' as a result. What am I doing wrong?
function substr_remove() {
echo "${1//$2/}"
}
substr_remove carfoobar123foo456 foo
Output:
carbar123456
Are you searching for something like this?
function ltrim() {
echo ${1##$2}
}
ltrim abcdefghijklmnopq abc # Prints: defghijklmnopq
echo '<script>var newUL = $("<ul>';
for($i=1;$i<=4;$i++)
{
echo "<li>"."abcd"."</li>";
}
echo '</ul>");';
echo "\n";
echo '$("#filemanager li").click(function(){$(this).append(newUL);});</script>';
echo '<script>$("#filemanager li").click(function(){alert($(this).text());}); </script>';
"#filemanager" is a div tag
I can't get text from one appended -li- ... it returns text of all appended -li-
By $("#filemanager li") command you've got a collection.
Try this:
$("#filemanager li").each(function(){
alert($(this).text())})