Zero-pad digits in string

Question

I need to cast single figures  1 to 9  to  01 to 09   I can think of a way but its big and ugly and cumbersome  I m sure there must be some concise way  Any Suggestions

User · Answer

Solution using str pad  str pad  digit 2  0  STR PAD LEFT    Benchmark on php 5 3  Result str pad   0 286863088608 Result sprintf   0 234171152115  Code   start   microtime true   for   i 0  i lt 100000  i          str pad 9 2  0  STR PAD LEFT       str pad 15 2  0  STR PAD LEFT       str pad 100 2  0  STR PAD LEFT      end   microtime true   echo  quot Result str pad    quot    end- start   quot  n quot     start   microtime true   for   i 0  i lt 100000  i          sprintf  quot  02d quot   9       sprintf  quot  02d quot   15       sprintf  quot  02d quot   100      end   microtime true   echo  quot Result sprintf    quot    end- start   quot  n quot

User · Answer

There s also str pad   lt  php  input    Alien   echo str pad  input  10                           produces  Alien       echo str pad  input  10   -    STR PAD LEFT       produces  - - -Alien  echo str pad  input  10       STR PAD BOTH        produces    Alien     echo str pad  input  6                            produces  Alien     gt

User · Answer

There s also str pad   lt  php  input    Alien   echo str pad  input  10                           produces  Alien       echo str pad  input  10   -    STR PAD LEFT       produces  - - -Alien  echo str pad  input  10       STR PAD BOTH        produces    Alien     echo str pad  input  6                            produces  Alien     gt

User · Answer

The performance of str pad heavily depends on the length of padding  For more consistent speed you can use str repeat   padded string   str repeat  quot 0 quot    length-strlen  number      number   Also use string value of the number for better performance   number   strval 123    Tested on PHP 7 4 str repeat  0 086055040359497    number  123  padding  1  str repeat  0 085798978805542    number  123  padding  3  str repeat  0 085641145706177    number  123  padding  10  str repeat  0 091305017471313    number  123  padding  100   str pad     0 086184978485107    number  123  padding  1  str pad     0 096981048583984    number  123  padding  3  str pad     0 14874792098999     number  123  padding  10  str pad     0 85979700088501     number  123  padding  100

User · Answer

There s also str pad   lt  php  input    Alien   echo str pad  input  10                           produces  Alien       echo str pad  input  10   -    STR PAD LEFT       produces  - - -Alien  echo str pad  input  10       STR PAD BOTH        produces    Alien     echo str pad  input  6                            produces  Alien     gt

User · Answer

First of all  your description is misleading  Double is a floating point data type  You presumably want to pad your digits with leading zeros in a string  The following code does that    s   sprintf   02d    digit     For more information  refer to the documentation of sprintf

User · Answer

First of all  your description is misleading  Double is a floating point data type  You presumably want to pad your digits with leading zeros in a string  The following code does that    s   sprintf   02d    digit     For more information  refer to the documentation of sprintf

User · Answer

First of all  your description is misleading  Double is a floating point data type  You presumably want to pad your digits with leading zeros in a string  The following code does that    s   sprintf   02d    digit     For more information  refer to the documentation of sprintf

User · Answer

There s also str pad   lt  php  input    Alien   echo str pad  input  10                           produces  Alien       echo str pad  input  10   -    STR PAD LEFT       produces  - - -Alien  echo str pad  input  10       STR PAD BOTH        produces    Alien     echo str pad  input  6                            produces  Alien     gt

User · Answer

First of all  your description is misleading  Double is a floating point data type  You presumably want to pad your digits with leading zeros in a string  The following code does that    s   sprintf   02d    digit     For more information  refer to the documentation of sprintf

User · Answer

Solution using str pad  str pad  digit 2  0  STR PAD LEFT    Benchmark on php 5 3  Result str pad   0 286863088608 Result sprintf   0 234171152115  Code   start   microtime true   for   i 0  i lt 100000  i          str pad 9 2  0  STR PAD LEFT       str pad 15 2  0  STR PAD LEFT       str pad 100 2  0  STR PAD LEFT      end   microtime true   echo  quot Result str pad    quot    end- start   quot  n quot     start   microtime true   for   i 0  i lt 100000  i          sprintf  quot  02d quot   9       sprintf  quot  02d quot   15       sprintf  quot  02d quot   100      end   microtime true   echo  quot Result sprintf    quot    end- start   quot  n quot

User · Answer

The performance of str pad heavily depends on the length of padding  For more consistent speed you can use str repeat   padded string   str repeat  quot 0 quot    length-strlen  number      number   Also use string value of the number for better performance   number   strval 123    Tested on PHP 7 4 str repeat  0 086055040359497    number  123  padding  1  str repeat  0 085798978805542    number  123  padding  3  str repeat  0 085641145706177    number  123  padding  10  str repeat  0 091305017471313    number  123  padding  100   str pad     0 086184978485107    number  123  padding  1  str pad     0 096981048583984    number  123  padding  3  str pad     0 14874792098999     number  123  padding  10  str pad     0 85979700088501     number  123  padding  100

[php] Zero-pad digits in string

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