Remove excess whitespace from within a string

Question

I receive a string from a database query  then I remove all HTML tags  carriage returns and newlines before I put it in a CSV file  Only thing is  I can t find a way to remove the excess white space from between the strings   What would be the best way to remove the inner whitespace characters

User · Answer

str   trim preg replace    s          str     The above line of code will remove extra spaces  as well as leading and trailing spaces

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str   preg replace     s            str

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To expand on Sandip   s answer  I had a bunch of strings showing up in the logs that were mis-coded in bit ly  They meant to code just the URL but put a twitter handle and some other stuff after a space  It looked like this    productID  26 20via 20 LFS   Normally  that would   t be a problem  but I   m getting a lot of SQL injection attempts  so I redirect anything that isn   t a valid ID to a 404  I used the preg replace method to make the invalid productID string into a valid productID    productID preg replace     s           productID     I look for a space in the URL and then remove everything after it

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none of other examples worked for me  so I ve used this one   trim preg replace     t n r s            text to clean up     this replaces all tabs  new lines  double spaces etc to simple 1 space

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str   str replace         str     Or  replace with underscore   amp  nbsp  etc etc

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I wrote recently a simple function which removes excess white space from string without regular expression implode      array filter explode       str

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You can use    str   trim str replace             str      This removes extra whitespaces from both sides of string and converts two spaces to one within the string  Note that this won t convert three or more spaces in a row to one  Another way I can suggest is using implode and explode that is safer but totally not optimum    str   implode      array filter explode       str       My suggestion is using a native for loop or using regex to do this kind of job

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There are security flaws to using preg replace    if you get the payload from user input  or other untrusted sources   PHP executes the regular expression with eval    If the incoming string isn t properly sanitized  your application risks being subjected to code injection   In my own application  instead of bothering sanitizing the input  and as I only deal with short strings   I instead made a slightly more processor intensive function  though which is secure  since it doesn t eval   anything   function secureRip string  str   string      Rips all whitespace securely        arr   str split  str  1      retStr         foreach   arr as  char         retStr    trim  char         return  retStr

User · Answer

If you want to replace only multiple spaces in a string  for Example   this string                        have lots of                        space        And you expect the answer to be   this string have lots of space   you can use the following solution    strng    this string                        have lots of                        space           strng   trim preg replace    s          strng     echo  strng

User · Answer

Not sure exactly what you want but here are two situations    If you are just dealing with excess whitespace on the beginning or end of the string you can use trim    ltrim   or rtrim   to remove it  If you are dealing with extra spaces within a string consider a preg replace of multiple whitespaces      with a single whitespace        Example    foo   preg replace    s           foo

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str    I      am a PHP   Developer    str length   strlen  str    str arr   str split  str   for   i   0   i  lt   str length   i         if  isset  str arr  i   1     amp  amp   str arr  i          amp  amp   str arr  i      str arr  i   1            unset  str arr  i             else        continue         echo implode      str arr

[php] Remove excess whitespace from within a string

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