# Problems related to multi-layer nested foreach ~

Source: Internet
Author: User
Foreach multi-layer nesting problem, solution ~! & Lt ;? Php \$ a1 = explode (',', '20, 21'); \$ b1 = explode (',', '20, 21'); \$ c1 = explode (', ', '20, 21'); \$ d1 = explode (', ', '20, 21'); \$ e1 = explode (', ', '20, foreach multi-layer nesting problem, solution ~!
```
\$a1=explode(',','20,21');\$b1=explode(',','20,21');\$c1=explode(',','20,21');\$d1=explode(',','20,21');\$e1=explode(',','20,21');foreach(\$a1 as \$a ){foreach(\$b1 as \$b){foreach(\$c1 as \$c){foreach(\$d1 as \$d){ foreach(\$e1 as \$e){ }}}}}?>```

Page error:
Rendering failed. specific error: loop nest level reach limited!

Excuse me,
This error is caused by PHP restrictions,
Or what?
If I have to nest so many layers,
Is there any good solution?

Thank you. give me some suggestions ~!
------ Solution --------------------
The purpose of your nesting is that \$ a1 is a multi-dimensional array, \$ b1 is a sub-array of \$ a1, and \$ c1 is a sub-array of \$ b1.
The example provided by the landlord is not suitable. your example is equivalent to \$ a1, \$ b1, and \$ c1 are mutually independent one-dimensional arrays. therefore
Traversal like you, of course, returns the result.
`foreach(\$a1 as \$a ){echo \$a;}foreach(\$b1 as \$b ){echo \$b;}`

\$ A1 and \$ b1 are independent of each other and there is no relationship between them.
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