# Ask PHP algorithm, two-dimensional array to take out one-dimensional array of the same ID as several new two-dimensional arrays.

Source: Internet
Author: User
PHP two-dimensional array algorithm

Little brother just learned PHP soon, encountered a problem, ask the heroes, thank you!

The two-dimensional array is as follows;
\$arr = Array (
Array (' ID ' =>100, ' value ' =>100),
Array (' ID ' =>100, ' value ' =>130,
Array (' ID ' =>100, ' value ' =>140),
Array (' ID ' =>100, ' value ' =>150),
Array (' ID ' =>101, ' value ' =>1600),
Array (' ID ' =>101, ' value ' =>100),
Array (' ID ' =>102, ' value ' =>100),
Array (' ID ' =>102, ' value ' =>100),
Array (' ID ' =>102, ' value ' =>100),
Array (' ID ' =>103, ' value ' =>100),
Array (' ID ' =>103, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>105, ' value ' =>100)
);

How to split into the following 5 two-dimensional arrays:
ARR1 (
Array (' ID ' =>100, ' value ' =>100),
Array (' ID ' =>100, ' value ' =>130,
Array (' ID ' =>100, ' value ' =>140),
Array (' ID ' =>100, ' value ' =>150)
);

ARR2 (
Array (' ID ' =>101, ' value ' =>1600),
Array (' ID ' =>101, ' value ' =>100)
);

ARR3 (
Array (' ID ' =>102, ' value ' =>100),
Array (' ID ' =>102, ' value ' =>100),
Array (' ID ' =>102, ' value ' =>100)
);

ARR4 (
Array (' ID ' =>103, ' value ' =>100),
Array (' ID ' =>103, ' value ' =>100)

);

ARR5 (
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>105, ' value ' =>100)
);

ARR5 (
Array (' ID ' =>105, ' value ' =>100)
);

ARR5 (
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
Array (' ID ' =>104, ' value ' =>100),
);

ARR6 (
Array (' ID ' =>105, ' value ' =>100)
);

??

Is it 6 arrays or 5 arrays? Two ARR5 the data is not the same?

Really don't understand ~ ~ ~ can you tell me the law? I didn't see the rules of the 6 arrays below you .... In particular, the two arr5 inside of the thing directly to the whole circle of people ...

6, the last ARR5 should be: ARR6

ARR6 (
Array (' ID ' =>105, ' value ' =>100)
);

Sorry, copy error.

Is the same ID to put in a two-dimensional array,
The above array has 6 kinds of id:100,101,102,103,104,105, which are to be put into 6 different two-dimensional arrays respectively.

`\$arr = array (' ID ' =>100, ' value ' =>100), array (' ID ' =>100, ' value ' =>130), array (' ID ' =>100, ' value ' = >140), array (' ID ' =>100, ' value ' =>150), array (' ID ' =>101, ' value ' =>1600), array (' ID ' =>101, ' value ' = >100), array (' ID ' =>102, ' value ' =>100), array (' ID ' =>102, ' value ' =>100), array (' ID ' =>102, ' value ' = >100), array (' ID ' =>103, ' value ' =>100), array (' ID ' =>103, ' value ' =>100), array (' ID ' =>104, ' value ' = >100), array (' ID ' =>104, ' value ' =>100), array (' ID ' =>104, ' value ' =>100), array (' ID ' =>105, ' value ' = >100)); foreach (\$arr as \$key + \$val) {\$newarr [\$val [' ID ']][]=array (' id ' = ' + ' \$val [' id '], ' value ' = * = \$val [' Value ']);} \$arr 1= \$newarr [' n ']; \$arr 2= \$newarr [' 101 ']; \$arr 3= \$newarr [' 102 ']; \$arr 4= \$newarr [' 103 ']; \$arr 5= \$newarr [' 104 ']; \$arr 6 = \$newarr [' 105 '];`

`\$arr = Array (  ' id ' =>100, ' value ' =>100),  array (' ID ' =>100, ' value ' =>130),  array (' id ' = >100, ' value ' =>140),  array (' ID ' =>100, ' value ' =>150),  array (' ID ' =>101, ' value ' =>1600), Array (  ' id ' =>101, ' value ' =>100),  array (' ID ' =>102, ' value ' =>100),  array (' ID ' =>102, ' Value ' =>100 ', array (  ' id ' =>102, ' value ' =>100),  array (' ID ' =>103, ' value ' =>100),  Array ( ' id ' =>103, ' value ' =>100),  array (' ID ' =>104, ' value ' =>100),  array (' ID ' =>104, ' value ' = =  Array (' ID ' =>104, ' value ' =>100),  array (' ID ' =>105, ' value ' =>100)); foreach (\$arr as \$v) \$ res[\$v [' id ']][] = \$v;//print_r (\$res);//You can directly use this array//You can also import the variable table after accessing Extract (Array_values (\$res), Extr_prefix_all, ' arr ') ;//such as Print_r (\$arr _3);`

Thank you very much AHUI_LCM and xuzuning, so simple conversion I did not think out, really ashamed.
Ask the next 2 and you heroes, how can I quickly improve the operation of the PHP array. are always affected by arrays in other languages.
Thank you! Score I'm still going to give the first brother AHUI_LCM to help me. Brother Xuzuning to answer the more perfect point, also very grateful to xuzuning.

`The code above//This code is run directly under the \$arr = array (' id ' = ' = ', ' value ' = ' + '), array (' id ' = +, ' value ' = '), a Rray (' id ' = +, ' value ' = + +), array (' id ' = ' = ', ' value ' = '), array (' id ' = = 101, ' value ' =&gt ; ), array (' id ' = = 101, ' value ' = +), array (' id ' = = 102, ' value ' = +), array (' id ' = = 102, ' VA Lue ' + + ', array (' id ' = = 102, ' value ' = +), array (' id ' = = 103, ' value ' = +), array (' ID ' =&gt ; 103, ' value ' = +), array (' id ' = = 104, ' value ' = +), array (' id ' = = 104, ' value ' = +), Array (' id ' = = 104, ' value ' = ' + ', array (' id ' = ' = ' value ' = ') '), foreach (\$arr as \$v) \$res [\$v [' id ']][] = \$v ; My_debug (\$res);//You can directly use this array//You can also import the variable table after accessing Extract (Array_values (\$res), Extr_prefix_all, ' arr '); My_debug (\$arr _0); My_debug (\$arr _1); My_debug (\$arr _2); My_debug (\$arr _3); function my_debug (\$v = null, \$var _name = null, \$ method = ' Dump ', \$backtrace = False) {\$display _none = ";" if (Defined (' FRONTPAGE ')) {\$display _none = "display:none;";} Print (""); \$call _stack = Debug_backtrace ();p rintf (' file:%s,%s (), line:%s' @ \$call _stack [0] [' file '], @ \$call _stack [1] [' function '], @ \$call _stack [0] [' line ']), if (! \$var _name) {//Take \$v in source code variable name  . \$v _line = file (\$call _stack [0] [' file ']) \$f _line = \$v _line [\$call _stack [0] [' line ']-1]; \$match = Array ();p Reg_match (' #my_debug. *[(].*# ', \$f _line, \$match); if (count (\$match)) {\$var _name = \$match [0];}} if (\$var _name) {printf (' Debug:%s ', \$var _name);} Xdebug_var_dump (\$v);p rint ('if (\$method = = ' dump ') {var_dump (\$v);} else {print_r (\$v);} Print (""), if (\$backtrace) {foreach (Debug_backtrace () as \$v) {echo (\$v [' file '].": ". \$v [' line ']. "," . \$v [' class ']. "," . \$v [' function ']. "() \ n\ n ");}} Print (');p rint ("\ n");}`

`My_debug (\$arr _0); My_debug (\$arr _1); My_debug (\$arr _2); My_debug (\$arr _3); My_debug (\$arr _4); My_debug (\$arr _5);/* Instructions to print out these are all out! ... my_debug is the effect function of my print Group!!!!! Very practical, you can also locate the line ... * *`
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