PHP remove special character from string

Question

I have problems with removing special characters  I want to remove all special characters except            -  amp    because I m setting that string as a title   I edited code from the original  look below    preg replace     a-zA-Z0-9  -            s        String     But this is not working to remove special characters like           s                      among others   original code   this works but it removes these characters             -  amp     preg replace     a-zA-Z0-9  -  s        String

User · Answer

preg replace     a-zA-Z0-9   -     - amp   s        String

User · Answer

Good try  I think you just have to make a few small changes    Escape the square brackets    and    inside the character class  which are also indicated by   and    Escape the escape character     itself Plus there s a quirk where - is special  if it s between two characters  it means a range  but if it s at the beginning or the end  it means the literal - character    You ll want something like this   preg replace     a-zA-Z0-9            -  s        String     See http   docs activestate com activeperl 5 10 lib pods perlrecharclass html special characters inside a bracketed character class if you want to read up further on this topic

User · Answer

You want str replace  because performance-wise it s much cheaper and still fits your needs    title   str replace  array                          lt      gt            rawtitle      Unless this is all about security and sql injection  in that case  I d rather to go with a POSITIVE list of ALLOWED characters    even better  stick with tested  proven routines    Btw  since the OP talked about title-setting  I wouldn t replace special chars with nothing  but with a space  A superficious space is less of a problem than two words glued together

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lt  php  string             amp   amp                 lt   gt    - lt h1 gt You   lt  h1 gt  lt p gt  text lt  p gt         string strip tags  string       string   preg replace     A-Za-z0-9 s  s-        string    echo  string   str replace  array   -               string     gt

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preg replace      w      - amp         string

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Your dot is matching all characters  Escape it  and the other special characters   like this   preg replace     a-zA-Z0-9               amp -  s        String

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See example          nv get plaintext          param mixed  string     return     function nv get plaintext   string   keep image   false   keep link   false            Get image tags     if   keep image                 if  preg match all      lt img    gt   src                 gt     gt  is    string   match                           foreach   match 0  as  key   gt    m                                  textimg                       if  strpos   match 1   key    data image png base64        false                                          textimg          match 1   key                                     if  preg match all      lt img    gt   alt                 gt     gt  is     m   m alt                                            textimg           m alt 1  0                                      string   str replace    m   textimg   string                                          Get link tags     if   keep link                 if  preg match all      lt a    gt   href                 gt     gt       lt   a  gt  isU    string   match                           foreach   match 0  as  key   gt    m                                  string   str replace    m   match 1   key           match 2   key    string                                        string   str replace             strip tags   string          return preg replace                  string

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mysqli set charset  con  utf8     title     LEVEL          EXTENDED     newtitle   preg replace       x20- x7F           title        echo  newtitle   Result    LEVEL EXTENDED   Many Strange Character be removed by applying  below the mysql connection code  but in some circumstances of removing this type strange character like       you can use preg replace above format

[php] PHP remove special character from string

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