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|
@require: class-slydifi/theme/akasaka
@require: code-printer/code-design
@require: code-printer/code-printer
@require: code-printer/code-syntax
@require: code-printer/code-theme
@require: figbox/figbox
let-block +code-block-php source =
'<
+code-printer?:(
CodePrinter.make-config CodeSyntax.php CodeTheme.iceberg-light
|> CodePrinter.set-number-fun CodeDesign.number-fun-null
)(source);
>
let-block +code-block-c source =
'<
+code-printer?:(
CodePrinter.make-config CodeSyntax.c CodeTheme.iceberg-light
|> CodePrinter.set-number-fun CodeDesign.number-fun-null
)(source);
>
open FigBox
in
document '<
+set-config(|
SlydifiThemeAkasaka.default-config with
color-emph = Color.black;
|);
+make-title(|
title = {
|list でない array の末尾を探す
|};
author = {|nsfisis (いまむら)|};
date = {|第151回PHP勉強会＠東京|};
|);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+frame{自己紹介}<
+fig-center(vconcat [
gap 75pt;
hconcat [
textbox{nsfisis (いまむら)};
gap 20pt;
include-image 50pt `assets/me.jpeg`;
];
gap 20pt;
textbox{\@ デジタルサーカス株式会社};
]);
>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+frame{配列の末尾挿入}<
+code-block-php(`<?php
$xs = [1, 2, 3];
$xs[] = 42;
assert($xs[3] === 42);
`#);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
"a" => 1,
"b" => 2,
"c" => 3,
];
$xs[] = 42;
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
"a" => 1,
"b" => 2,
"c" => 3,
];
$xs[] = 42;
assert($xs[0] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
0 => 1,
1 => 2,
3 => 4,
];
$xs[] = 42;
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
0 => 1,
1 => 2,
3 => 4,
];
$xs[] = 42;
assert($xs[4] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
-10 => 1,
-7 => 2,
-5 => 4,
];
$xs[] = 42;
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
-10 => 1,
-7 => 2,
-5 => 4,
];
$xs[] = 42;
assert($xs[-4] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [];
$xs[10] = 1;
$xs[] = 42;
$xs[5] = 2;
$xs[] = 57;
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [];
$xs[10] = 1;
$xs[] = 42;
$xs[5] = 2;
$xs[] = 57;
assert($xs[11] === 42);
assert($xs[12] === 57);
`);
>
+section{|php-srcを読む|}<
+frame{ZEND_ASSIGN_DIM}<
+listing{
* \inline-code(`Zend/zend_vm_opcodes.h`);
** PHP の VM (virtual machine) の opcode (operation code) 一覧
}
>
+frame{ZEND_ASSIGN_DIM}<
+listing{
* \inline-code(`Zend/zend_vm_opcodes.h`);
** PHP の VM (virtual machine) の opcode (operation code) 一覧
* \inline-code(`ZEND_ASSIGN_DIM`);
** 配列への代入 (assign dimensional)
}
>
+frame{ZEND_ASSIGN_DIM}<
+listing{
* \inline-code(`Zend/zend_vm_opcodes.h`);
** PHP の VM (virtual machine) の opcode (operation code) 一覧
* \inline-code(`ZEND_ASSIGN_DIM`);
** 配列への代入 (assign dimensional)
* \inline-code(`Zend/zend_vm_def.h`);
** 各 opcode のハンドラが定義されている
}
>
+frame{php-srcを読むヒント}<
+listing{
* \inline-code(`EXPECTED`);
** よく通るパス。最も一般的なケース
* \inline-code(`UNEXPECTED`);
** ほとんど通らないパス。エラー処理など
}
>
+frame{zend_hash_next_index_insert}<
+code-block-c(`value = zend_hash_next_index_insert(
Z_ARRVAL_P(object_ptr),
value
);`);
+p{※説明のためやや改変}
>
+frame{zend_hash_next_index_insert}<
+code-block-c(`zval* zend_hash_next_index_insert(
HashTable *ht,
zval *pData
) {
return _zend_hash_index_add_or_update_i(
ht,
ht->nNextFreeElement, /* 挿入先のインデックス */
pData,
HASH_ADD | HASH_ADD_NEXT
);
}
`);
+p{※説明のためやや改変}
>
+frame{nNextFreeElement}<
+listing{
* \inline-code(`Zend/zend_hash.c`);
* \inline-code(`_zend_hash_index_add_or_update_i()`);
}
>
+frame{nNextFreeElement}<
+listing{
* \inline-code(`Zend/zend_hash.c`);
* \inline-code(`_zend_hash_index_add_or_update_i()`);
}
+p{
\inline-code(`array`);に数値のキーで代入したとき、そのキーが\inline-code(`nNextFreeElement`);以上なら、その値+1になる
}
>
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
"a" => 1,
"b" => 2,
"c" => 3,
];
$xs[] = 42;
assert($xs[0] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
0 => 1,
1 => 2,
3 => 4,
];
$xs[] = 42;
assert($xs[4] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [
-10 => 1,
-7 => 2,
-5 => 4,
];
$xs[] = 42;
assert($xs[-4] === 42);
`);
>
+frame{PHP クイズ}<
+code-block-php(`<?php
$xs = [];
$xs[10] = 1;
$xs[] = 42;
$xs[5] = 2;
$xs[] = 57;
assert($xs[11] === 42);
assert($xs[12] === 57);
`);
>
+frame{おまけ}<
+code-block-php(`<?php
$xs = [1, 2, 3];
$xs[] += 10;
`);
+p{末尾代入と複合代入演算子は同時に使える}
>
>
|
