Remove portion of a string after a certain character

Question

I m just wondering how I could remove everything after a certain substring in PHP  ex   Posted On April 6th By Some Dude   I d like to have it so that it removes all the text including  and after  the sub string  By   Thanks

User · Answer

Austin s answer works for your example case   More generally  you would do well to look into the regular expression functions when the substring you re splitting on may differ between strings     variable   preg replace   By           variable

User · Answer

var    Posted On April 6th By Some Dude    new var   substr  var  0  strpos  var    By

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You can use list and explode functions   list  result    explode  By    Posted On April 6th By Some Dude   2       result is  Posted On April 6th

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By using regular expression   string   preg replace    s By            string

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Below is the most efficient method  by run-time  to cut off everything after the first By in a string  If By does not exist  the full string is returned  The result is in  sResult    sInputString    Posted On April 6th By Some Dude    sControl    By      Get Position Of  By   iPosition   strpos  sInputString       sControl   if   iPosition     false      Cut Off If String Exists    sResult   substr  sInputString  0   iPosition   else     Deal With String Not Found    sResult    sInputString      sResult    Posted On April 6th    If you don t want to be case sensitive  use stripos instead of strpos  If you think By might exist more than once and want to cut everything after the last occurrence  use strrpos   Below is a less efficient method but it takes up less code space  This method is also more flexible and allows you to do any regular expression    sInputString    Posted On April 6th By Some Dude    pControl    By     sResult   preg replace       pControl     s        sInputString       sResult    Posted On April 6th    For example  if you wanted to remove everything after the day    sInputString    Posted On April 6th By Some Dude    pControl     0-9  1 2  a-z  2      1 or 2 numbers followed by 2 lowercase letters    sResult   preg replace       pControl     s        sInputString       sResult    Posted On April    For case insensitive  add the i modifier like this    sResult   preg replace       pControl     si        sInputString     To get everything past the last By if you think there might be more than one  add an extra    at the beginning like this    sResult   preg replace         pControl     si        sInputString     But here is also a really powerful way you can use preg match to do what you may be trying to do    sInputString    Posted On April 6th By Some Dude     pPattern     Posted On       By       s   if  preg match  pPattern   sInputString   aMatch         Deal With Match      aMatch 1     April 6th       aMatch 2     Some Dude    else       No Match Found     Regular expressions might seem confusing at first but they can be really powerful and your best friend once you master them  Good luck

User · Answer

If you re using PHP 5 3  take a look at the  before needle flag of strstr     s    Posted On April 6th By Some Dude   echo strstr  s   By   true

User · Answer

variable   substr  variable  0  strpos  variable   By       In plain english   Give me the part of the string starting at the beginning and ending at the position where you first encounter the deliminator

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You could do    posted   preg replace    By           posted   echo  posted

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One method would be    str    Posted On April 6th By Some Dude   echo strtok  str   By       Posted On April 6th

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Use the strstr function    lt  php  myString    Posted On April 6th By Some Dude    result   strstr  myString   By   true    echo  result     The third parameter true tells the function to return everything before first occurrence of the second parameter

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Why     This is likely overkill for most people s needs  but  it addresses a number of things that each individual answer above does not  Of the items it addresses  three of them were needed for my needs  With tight bracketing and dropping the comments  this could still remain readable at only 13 lines of code   This addresses the following    Performance impact of using REGEX vs strrpos strstr strripos stristr  Using strripos strrpos when character string not found in string  Removing from left or right side of string  first or last occurrence    CaSe Sensitivity  Wanting the ability to return back the original string unaltered if search char string not found    Usage   Send original string  search char string   R   L  for start on right or left side  true false for case sensitivity  For example  search for  here  case insensitive  in string  start right side   echo TruncStringAfterString  Now Here Are Some Words Here Now   here   R  false     Output would be  Now Here Are Some Words    Changing the  R  to an  L  would output   Now     Here s the function   function TruncStringAfterString  origString  truncChar  startSide  caseSensitive        if   caseSensitive  true  amp  amp  strstr  origString  truncChar    false                   IF START RIGHT SIDE          if  strtoupper  startSide    R      startSide  false                 Found  strip off all chars from truncChar to end             return substr  origString 0 strrpos  origString  truncChar                          IF START LEFT SIDE           elseif  strtoupper  startSide    L      startSide        startSide  true                 Found  strip off all chars from truncChar to end             return strstr  origString  truncChar true                                  elseif   caseSensitive  false  amp  amp  stristr  origString  truncChar    false                              IF START RIGHT SIDE           if  strtoupper  startSide    R      startSide  false                 Found  strip off all chars from truncChar to end             return substr  origString 0 strripos  origString  truncChar                          IF START LEFT SIDE           elseif  strtoupper  startSide    L      startSide        startSide  true                 Found  strip off all chars from truncChar to end             return stristr  origString  truncChar true                              else            NOT found - return origString untouched         return  origString         Nothing to do here

User · Answer

preg replace offers one way    newText   preg replace    bBy            text

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variable   substr  initial  0  strpos  initial   By      if   empty  variable     echo  variable    else   echo  initial

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How about using explode    input    Posted On April 6th By Some Dude    result   explode   By   input   return  result 0     Advantages    Very readable   comprehensible Returns the full string if the divider string    By  in this example  is not present   Won t return FALSE like some of the other answers   Doesn t require any regex     Regular expressions are like a particularly spicy hot sauce     to be used in moderation and with restraint only when appropriate   Regex is slower than explode  I assume preg split is similar in speed to the other regex options suggested in other answers   Makes the second part of the string available too if you need it   result 1  would return Some Dude in this example

User · Answer

Hey I thought this may be useful for someone who wants to replace the characters comes after the  quot By quot   for example in the text he given has by at the 20th position of his string so if you want to ignore the by you should add   2 to the position then which will ignore the 20th position and it will replace all after coming the by it will work if you give the exact character length of the text you re gonna replace   variable   substr  variable  0  strpos  variable   quot By quot     2

User · Answer

Try this   function strip after string  str  char                 pos strpos  str  char               if   pos   false                            char was found  so return everything up to it              return substr  str 0  pos                      else                          this will return the original string if  char is not found   if you wish to return a blank string when not found  just change  str to                return  str                     Usage     lt  php       returns Apples      clean string  strip after string   Apples  Oranges  Banannas          gt

[php] Remove portion of a string after a certain character

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