while loop in the PHP code excecuting infinite times
<?php
$string="I am Azizul hakim.I am a student.I am feeling good today";
$find="am";
$i=0;
$find_length=strlen($find);
while($i<strlen($string))
{
$pos=strpos($string,$find,$i);
echo $pos;
$i=$pos+$find_length;
}
?>
The php code is executing infinite times.Although the limit is restricted by specifying the string length of the string.Why it is executing infinite times?
php while-loop strpos
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
add a comment |
<?php
$string="I am Azizul hakim.I am a student.I am feeling good today";
$find="am";
$i=0;
$find_length=strlen($find);
while($i<strlen($string))
{
$pos=strpos($string,$find,$i);
echo $pos;
$i=$pos+$find_length;
}
?>
The php code is executing infinite times.Although the limit is restricted by specifying the string length of the string.Why it is executing infinite times?
php while-loop strpos
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
1
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be abreakif$pos === false
– Isitar
Dec 31 '18 at 14:01
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06
add a comment |
<?php
$string="I am Azizul hakim.I am a student.I am feeling good today";
$find="am";
$i=0;
$find_length=strlen($find);
while($i<strlen($string))
{
$pos=strpos($string,$find,$i);
echo $pos;
$i=$pos+$find_length;
}
?>
The php code is executing infinite times.Although the limit is restricted by specifying the string length of the string.Why it is executing infinite times?
php while-loop strpos
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
<?php
$string="I am Azizul hakim.I am a student.I am feeling good today";
$find="am";
$i=0;
$find_length=strlen($find);
while($i<strlen($string))
{
$pos=strpos($string,$find,$i);
echo $pos;
$i=$pos+$find_length;
}
?>
The php code is executing infinite times.Although the limit is restricted by specifying the string length of the string.Why it is executing infinite times?
php while-loop strpos
php while-loop strpos
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
asked Dec 31 '18 at 13:50
Azizul Hakim ChowdhuryAzizul Hakim Chowdhury
64
64
While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
1
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be abreakif$pos === false
– Isitar
Dec 31 '18 at 14:01
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06
add a comment |
While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
1
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be abreakif$pos === false
– Isitar
Dec 31 '18 at 14:01
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06
While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
1
1
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be a
break if $pos === false– Isitar
Dec 31 '18 at 14:01
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be a
break if $pos === false– Isitar
Dec 31 '18 at 14:01
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06
add a comment |
2 Answers
2
active
oldest
votes
strpos returns false, which evaluates to 0, when your remaining $string doesn't contain $find and the loop starts over again.
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
add a comment |
In cases like this, I believe perl compatible regular expression, (pcre), is always the best choice. Why, because you will use only (1) function / method call, and then simple loop to process the result. With string type functions / methods, each time your $needle is found in your $haystack you will need to call another string type function / method to handle the next occurrence of your $needle being found in your $haystack!
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
add a comment |
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2 Answers
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2 Answers
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active
oldest
votes
strpos returns false, which evaluates to 0, when your remaining $string doesn't contain $find and the loop starts over again.
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
add a comment |
strpos returns false, which evaluates to 0, when your remaining $string doesn't contain $find and the loop starts over again.
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
add a comment |
strpos returns false, which evaluates to 0, when your remaining $string doesn't contain $find and the loop starts over again.
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
strpos returns false, which evaluates to 0, when your remaining $string doesn't contain $find and the loop starts over again.
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
answered Dec 31 '18 at 14:06
IsaacIsaac
3901725
3901725
add a comment |
add a comment |
In cases like this, I believe perl compatible regular expression, (pcre), is always the best choice. Why, because you will use only (1) function / method call, and then simple loop to process the result. With string type functions / methods, each time your $needle is found in your $haystack you will need to call another string type function / method to handle the next occurrence of your $needle being found in your $haystack!
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
add a comment |
In cases like this, I believe perl compatible regular expression, (pcre), is always the best choice. Why, because you will use only (1) function / method call, and then simple loop to process the result. With string type functions / methods, each time your $needle is found in your $haystack you will need to call another string type function / method to handle the next occurrence of your $needle being found in your $haystack!
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
add a comment |
In cases like this, I believe perl compatible regular expression, (pcre), is always the best choice. Why, because you will use only (1) function / method call, and then simple loop to process the result. With string type functions / methods, each time your $needle is found in your $haystack you will need to call another string type function / method to handle the next occurrence of your $needle being found in your $haystack!
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
In cases like this, I believe perl compatible regular expression, (pcre), is always the best choice. Why, because you will use only (1) function / method call, and then simple loop to process the result. With string type functions / methods, each time your $needle is found in your $haystack you will need to call another string type function / method to handle the next occurrence of your $needle being found in your $haystack!
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
answered Dec 31 '18 at 16:39
Stephanie TempleStephanie Temple
1923
1923
add a comment |
add a comment |
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While not familiar with PHP think about unmet condition of '$i=$pos+$find_length;'
– bummi
Dec 31 '18 at 13:57
1
please debug your code before you post. strpos returns false when your remaining string doesn't contain any $find. so it will loop back to 0 + $find_length => 2, A simple fix would be a
breakif$pos === false– Isitar
Dec 31 '18 at 14:01
Yes I have run that one and it works fine.But what is the problem with this one? @bummi
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:02
OK thanks got it. @Isitar
– Azizul Hakim Chowdhury
Dec 31 '18 at 14:04
I guess that strpos can return negative values, when $i (search offset) grows bigger than length of $string. Add an additional condition to while loop e.g. $i >= 0
– FlorIT
Dec 31 '18 at 14:06